TA BLE OF CO N TEN TS SE CTIO N 1
SECTIO N 2
SPE CI FICATIO N S Introduction Electrical Ch aracteristics Sweep Rate Sweep Accuracy Sweep L ength Sweep H ol d-Off Time External H orizontal Am plifier Deflection F actor F requency Response Trigger Sensitivity Internal Trigger J itter External Trigger Input Ρ-Ρ Auto Sensitivity Environmental Characteristics Altitud e Ph ysical Characteristics F inish Dimensions Weight OPER ATING I NSTRU CTIO NS General Installation F ront Panel Controls Test Setu p Chart General Operating Information Sweep Calibration Check Sim plified Op erating Instructions N ormal Sweep Magnifie d Swee p Delaye d Swee p Pushbutton Switch Logic Triggere d L ight Trigger Mode Trigger Coup ling Trigger Source Trigger Slope Trigger Level H orizontal Sweep Rate Sweep M agnifier H orizontal Position Control Display Mode
Page 1-1 1-1 1-1 1-1 1-1 1-1 1-1 1-1 1-2 1-2 1-2 1-2 1-2 1-2 1-2 1-2 1-2 2-1 2-1 2-1 2-4 2-4 2-4 2-4 2-6 2-6 2-6 2-6 2-6 2-7 2-8 2-9 2-10 2-10 2-10 2-12 2-12 2-12
TA BLE O F CO N T EN TS (cont) SECTION 2
SECTION 3
OPER ATI N G I NSTRUCTIONS (cont) A pp lications General F req uency Com parison Time Duration M easurements Determining F req uency Risetime Measurements Delayed Sweep Time Measurements Delaye d Swee p M ag n ification Disp laying Com p lex Signals U sing Delaye d Swee p Pulse J itter Measurements Χ-Υ Phase Measurements
2-13 2-13 2-13 2-14 2-15 2-15 2-16 2-17 2-18 2-18 2-19
CI R CU IT D ESCR I PTION
Intro d uction B loc k Diagram Descri p tion Detaile d Circuit Descri p tion Trigger In p ut Trigger Am p lifier In p ut Stage
Peak Detector Slo pe Comparator Out p ut Stage Trigger Generator Trigger Pulse Generator Sweep Gate Stage Triggered H ol d-Off Stage Bright L ine Auto External H orizontal Am p lifier Time- Base Generator General N ormal Trigger Mo d e O peration Single Swee p Operation Alternate O peration Delaye d Swee p Operation Horizontal Pream p Rea d out B loc k
SE CTION 4
Page
MAI NTENANC E P reventive Maintenance General Cleaning Visual Ins p ection Transistor Ch ec ks Recalibration
3-1 3-1 3-1 3-1 3-2 3-3 3-3 3-4 3-4 3-4 3-4 3-4 3-5 3-5 3-5 3-6 3-6 3-7 3-8 3-8 3-9 3-9 3-9 4-1 4-1 4-1 4-1 4-1 4-1
TABLE OF CONTENTS (cont) SECTION 4
MAINTENANCE (cont) Troubleshooting Troubleshooting Aids Troubleshooting Equipment Troubleshooting Techniques Corrective Maintenance Obtaining Replacement Parts Soldering Techniques Component Replacement Instrument Repackaging
Page 4-2 4-2 4-3 4-3 4-5 4-5 4-6 4-7 4-8
SECTION 5
PERFORMANCE CHECK/CALIBRATION Introduction Test Equipment Required Short Form Procedure Performance Check/Calibration Procedure General Preliminary Control Settings Check/Adjust Steps (refer to Short-Form Procedure for index to steps)
5-1 5-1 5-2 5-4 5-4 5-4 5-5
SECTION 6
ELECTRICAL PARTS LIST Abbreviations and Symbols Parts Ordering Information Index of Electrical Parts List
SECTION 7
DIAGRAMS AND MECHANICAL PARTS ILLUSTRATIONS Diagrams Mechanical Parts Illustrations
SECTION 8
MECHANICAL PARTS LIST Mechanical Parts List Information Index of Mechanical Parts Illustrations Mechanical Parts List Accessories
CHANGE INFORMATION Abbreviations and symbols used in this manual are based on or taken directly from IEEE Standard 260 "Standard Symbols for Units", MIL STD-12B and other standards of the electronics industry . Change information, if any, is located at the rear of this manual .
ί7Β70
S E CTIO N 1 7Β70 SPE CIFICA ΤΙΟ Ν Change info rmation, if any, affecting this section will be found at the rear of the mαηυαΙ.
Intro d uction
T he 71370 Time Base U nit is designed specifically fo r use with Tektronix 7700-se ries oscillosco pes . H owever, it is compatible with all 7000-series oscillosco pes . The 71370 provi d es cali brated swee ps from 5 seconds/d ivision to 0.02 microsecond /d ivision . The Χ10 M AG N IF I ER exten d s the cali brated swee p to 2 nanoseconds/division . Swee p rates may b e varied continuously (u ncali brated) between calibrate d steps. Swee p trigge ring is to 200 mega hertz or ve rtical .amplifier bandwidth , wh ichever is less . The 71370 features an external horizontal am plifier to display signals applied to
the ΕΧΤ V O LTS
IN connector. The sweep free-runs to p rovide α bright b ase line in the absence of ad eq uate triggeri ng signal in Ρ-Ρ AUTO an d AUTO trigge ring modes .
T he P erformance Chec k Prιcedu re give n in Section 5 provi d es α convenient method of chec king performance of this i nstrument . The following electrical characteristics apply at an am bient temperature of 0°C to +50° C, u nless ot herwise note d . W armu p time for give n accu racy is 20 mi nutes.
TA BLE 1-1 ELECT RICAL CHARACTER ISTICS Ch aracteristic
C haracteristic
Performa nce
Sweep Rate Calibrated Range
VA R IA BLE Range (uncalibrated)
Sweep Accu racy
Time Interval Over Center 8 d iv 5 s/d iv to 0.1 s/div an d 0.2 μs/div to 0.02 μs/div 50 ms/div to 0.5 μs/d iv
©A
Over any 2 div interval withi n ce nter 8 div
5 seconds/division to 0.02 microsecon d/division in α 1-2-5 seque nce . Χ 10 mag nifier extends sweep rate to 2 nanoseco n d s/division . Continuously var ia b le between calibrated sweep rates . Exte nd s u ncalibr ate d sweep rate to at least 12 .5 seconds/d ivision.
M easured in 7700-series mainframe. +15° C to +35 ° C
0°C to +50°C
U nmag
M ag
U nmag
M ag
3%
3.5%
4%
5%
3%
4%
2%
2.5% 5%
7%
Performa nce
E xclu d e Following P ortions of Magnified Swee p
Start of Swee p ; 50 ns
Swee p Lengt h
10 .0 d ivisio ns to 13 d ivisio ns.
End of Swee p ; beyon d 100 d ivisions
Sweep H ol d -Off Time 5 s/d iv to 5 μs/div
1 .5 times the TIME/DIVISION setting or less .
2 μs/d iv to 0.02 μs/div
3.5 microseconds or less .
External H orizontal Amplifier Deflection Factor ΕΧΤ VA R IA BLE Fully Cloc kwise
25 millivolts/d ivisio n with in 5 millivolts/d ivisio n.
ΕΧΤ = 10 VA R IA BLE Fu lly Cloc k-
250 millivolts/d ivision with in 50 millivolts/divisio n .
wise
VA R IA BLE R ange
At least 10 :1
Specification-71370 TA BLE 1-1 (cont)
TA BLE 1-1 (cont)
Frequency R esponse
AC, AC LF REJ, AC HF REJ
System -3 d B poi nts in 7700-series oscillosco pe.
Trigge r Sensitivity
Coup ling AC AC LF REJ2
AC HF REJ DC
External Trigger Input
M aximum In put
500 volts (DC + Pea k AC). 500 volts (P- Ρ AC) at 1 k ilohertz or less . 1 megohm within 2°/ο, 20 picofarads with in 2 p icofarads.
Voltage
L ower -3 d B
Upper -3 d B
16 h ertz
100 k ilohertz
Input R a nd C
-----
100 k ilohertz
Level
Triggering F req ue ncy R ange'
Minimum Triggering Signal R eq uired
DC
ΙΝΤ
P erformance
Characteristic
Performance
Characteristic
ΕΧΤ
30 H z to 20 MHz 0.3 div 75 mV 20 MHz to 1 .5 d iv 375 mV 200 MH z 30 kH z to 0.3 div 75 mV 20 MHz 20 MHz to 1 .5 div 275 mV 200 MHz 30 H z to 50 kH z 0.3 d iv 75 mV 0.3 d iv 75 mV DC to 20 MH z 20 MH z to 1 .5 div 375 mV 200 MHz
'On Internal Triggering Only ; the specified up per -3 d B frequency of the Vertical System re places upp er limit frequencies in the above table wh en the number in the ta ble is greater than the -3 dB freq ue ncy of the Vertical System .
R ange (Exclu d ing Ρ-Ρ AUTO)
ΕΧΤ
At least +1 .5 volts to -1 .5 volts.
ΕΧΤ _ 10
At least +15 volts to -15 volts.
Ρ-Ρ AUTO Operation Sensitivity
L ow Frequency R esponse
0.5 div Internal, 125 millivolts External, 200 Hz to 20 MHz. Upper frequ ency and amplitude limits same as N O RM AL T rigger Sensitivity .
Mu st Trigge r on 50 h ertz, 2 d ivision signal .
TA BLE 1-2 ENV I RONMEN TA L CHARACTER ISTICS
Th is instrument will meet the electrical cha racteristics given in Table 1-1 over the following environme n tal limits. Characteristic
Perfo rmance
Altitude Non-operating
Ζ W ill not trigger on sine waves of 3 d ivisions or less internal or 1 .5 volts external below 120 H z.
To 50,000 feet and -55° C.
TA BLE 1-3 PH YSICAL CHAR ACT ER ISTICS
Single Sweep
Internal Trigge r J itter
Triggering req uirements same αε normal sweep. Wh en triggere d , swee p generator produces οηε swee p only .
1 nanosecond or less at 150 mega
h ertz .
Characteristic
Performance
F inis h
Front panel is anod ized aluminum .
Dimensions
14 .583 inches lo ng by 2.75 inch es wi d e b y 5 inches h ig h.
W eight
Ap p roximately 2 .88 p ounds.
O p erating Instructions-71370
S E CTIO N 2 OPERATING INSTRUCTIONS Change information, if an y, affecting th is section will be found at th e rear of the manual.
General
T h e 71370 p lug-in unit o p erates wit h α Tek tronix 7000-series ind icator oscilloscope an d α 7A-series vertical p lug-in unit to form α com p lete oscillosco pe system . To effectively use th e 71370 its o p eratio n and cap abilities s h ould be k nown . T h is section describes t h e o p eration of t h e front- p anel controls, gives first-time an d general o p erating informatio n an d lists some basic a p p licatio n s for t h is instrument .
Installation
Th e 71370 is designed to o p erate in t h e h orizo n tal p lug-in com p artments of Te k troni x 7000-series oscillosco p es . Th e 71370 can also be i nstalled in α vertical plug-in com partment to p rovi d e α swee p t h at runs vertically on t h e C R T . However, w h en use d in th is manner, t h ere is no retrace blan k ing or internal triggering p rovision an d t h e unit m a y not m eet t h e s p ecifications given in Sectio n 1 . T h e instructions in t h is manual are written for use of t h e 71370 in α h orizontal p lug-in com p artme n t of th e oscillosco p e . Wh en the 71370 is use d with an oscilloscope w h ic h h as two h orizontal p lug-in co mpartments, install t h is unit in th e Β (righ t) com p artment . Th en, if α d elaying-swee p unit is installed -in t h e Α (D EL AYI N G TIME B AS E ) com part m ent, d elayed -swee p o p eration is available . T h e 71370 will o p erate
pro p erly in th e Α com p artment for all h orizontal mo d es of o peration exce p t delaying swee p . To install th e 71370 into α p lug-in com p artment, p ush it in until it fits firmly into t h e in d icator p lug-in com p artment . To remove, pull t h e release latc h (see F ig . 2-1) to d isengage t h e unit from t h e in d icato r and pull it out of t h e plug-in com p art ment . Even t h oug h t h e h orizo n tal gain of t h e in d icator oscillosco p e is stan d ar d ized to minimize a dj ustment wh en inserting p lug-in units, t h e s w ee p calibration of th e 71370 s h ould be c hec k ed w h en it is inserted into t h e indicator to verify measurement accuracy . T h e p roce d ure for c h ec k ing t h e unit is give n under Sweep Calibration C h ec k in t h is section .
F R O N T- P A N E L
CO NT R O L S
General All controls req uire d for th e o peration of t h e 71370 are located on t h e fro n t panel of t h e u n it (see F ig. 2-2) . To ma k e full use of t h e ca pabilities of t h is instrument, t h e o p erator s h ould be familiar wit h t h e f unction an d use of eac h of t h ese controls . Α brief d escri p tion of t h e frontp an el controls and connector is gi ven h ere . M ore detaile d information is given un d er General O p erating Information .
Triggering Controls
F ig . 2-1 . L ocation of r elease latch .
L E VEL /S L O PE
Selects t h e am p litude p oint an d slo p e of trigger signal on wh ic h th e swee p is triggere d . Wh en th e in d icator line on t h e outer ring is to th e left of center, t h e sweep is triggered on t h e positive-going slope of th e trigger signal, as s h own by th e positive-going waveform . To th e rig h t of center, t h e sweep is triggere d on t h e negative-going slo p e of th e trigger signal as s h own by th e negative-going waveform .
TR IG'D
L ig h t
in d icates t h at t h e swee p is triggered and will p ro d uce α d is p lay wit h correct setting of t h e POSITION control an d t h e controls on t h e associated vertical unit and indicator oscillosco pe .
Operating Instructions-71370
M OD E
signal is inade q uate, there is no trace.
Series of push -button switches t6 select the trigger mod e. Selecte d mo d e is indicated by ligh ted b utton.
SI NGLE SWP : Sweep initiated by the ap p lie d trigger signal at any p oint selected by th e LEVEL/ S LOPE control over the freq uency range selecte d by the CO UPLI NG switch. Triggere d sweep can be obtai ne d only over t h e am p litu de range of ap p lied
Ρ- Ρ AUTO : Sweep automatically triggered at point selected by the LEVEL/SLOPE co n trol when the trigger signal repetition rate is above about 200 h ertz and wit h in t h e fre q uency range selecte d by th e COUPL I N G switc h . Triggered sweep can be obtained
trigger
swee p
swee ps cannot be p resented until t h e RE S E T- RE ADY p us h -
t h roug h out th e entire range of t h e LEVEL /S L OPE control .
Wh e n t h e
is p r essed. Wh en LEVEL /S LOPE control is si d e t h e am p litude range,
trigger re p etition rate
button
below t h e lower freq uency limit (or above u pp er limit for is
N O RM : Swee p initiated by t h e
ap plied trigger signal at any p oi nt selecte d by the LEVEL/ S LOPE control over the fre q u en,.γ range selecte d by the CO UPL I N G switch . Triggered sweep can be obtained only over the amplitu d e range of t h e app lied t rigger signal . Wh en th e LEVEL / SLOPE control is outsi de the am p litu de range, the trigger re petition rate is outside the freq uency range selected b y the CO UPLIN G switch or the trigger
2-2
t he
out-
th e
trigger re petition rate is outsi d e
AC HF REJ) or when the trigger signal is inade q uate, the swee p free runs at th e sweep rate selec ted by th e ΤΙΜΕ /DI V switch to produce α reference trace.
A UTO : Sweep initiated by th e a pp lied trigger signal at p oint selected by the LEVEL/S LOPE control when the trigger signal repetition rate is above about 30 h ertz an d with in the freq uency r ange selected by th e CO UPL I NG switch . Triggere d swee p can b e obtained only over the am plitude range of the ap p lied trigger signal . Wh en the LEVEL/ SLOPE control is outside the amp litude range, the trigger re p etition rate is below the lower fre q uency limit (or above u pp er limit for AC HF REJ) or the trigger signal is inad eq uate, the sweep free runs at the sweep rate selecte d b y th e ΤΙΜΕ /DI V switch to produce α reference trace.
signal . After th e first is dis p layed, furt h er
t he frequency range selected by
t h e CO UPLI NG switch, the trigger signal is inadequate or when the RESET- RE ADY light is off, t h ere is no trace. RE S E T- READY : Pu sh-button to reset the Sweep Generator for the next sweep i n th e si n gleswee p mo d e . T h e RESETREADY button remains lighte d to indicate that the unit is rea d y to be triggered . After the unit is triggered an d α sweep is completed , the RESET- RE ADY light goes out until th e button is p ressed again.
CO UPL I N G
Series of pus h-button switches to select the trigger coupling . Selected coupling is indicated b y lighted button . AC : Rejects DC and attenuates AC signals below about 30 h ertz . Accep ts signals between 30 h ertz and 200 mega hertz . AC LF REJ : Rejects DC an d attenuates signals below about 30 k iloh ertz. Accepts signals between 30 k ilohertz an d 200 mega hertz . AC HF REJ: Acce p ts signals between about 30 h ertz an d 50 kilohertz . Rejects DC an d attenuates signals outside th is freq ue ncy range.
O p erating Instructions-71370
SWEEP
CONTROLS
Fig . 2-2 . Fro nt- Pa nel co ntrols and con n ectors .
SO UR C E
DC : Accep ts al Ι trigger signals from DC to 200 mega h ertz .
line voltage a p plied to t h is instrument .
Series of p ush -button switc h es to select th e trigger source . Selected source is in d icate d by ligh te d button .
ΕΧΤ : Trigger signal obtained from an external signal app lie d to t h e ΕΧΤ T R Ι G IN connector .
ΙΝΤ : Trigger signal obtaine d internally from α vertical unit . Trigger signal obtaine d internally from α sam p le of t h e
L I NE :
Α
ΕΧΤ - 10 : Trigger signal obtained from an external signal ap p lied to t h e ΕΧΤ T R IG IN connector as in t h e ΕΧΤ p osition . In t h is p osition t h e external sig n al is 2- 3
Operating Instructions-71370 attenuated 10 ti mes before it is Dis p lay M ode a p plied to the trigger circuit. Selects TIME B AS E swee p rates as determined by ΤΙΜΕ /DIV switch . ΕΧΤ TR IG IN or Ιηρυτ co nnector for external trigger ΕΧΤ V OLTS IN signal or am plifier in put signal . AMPL I FI ER Displays signals ap plied to the ΕΧΤ TR IG IN or ΕΧΤ VOLTS IN connector. Select TR IGGER ING SO UR CE and CO UPL I N G . Sweep Controls
P OSITIO N
Controls h orizontal p osition of display .
FINE
Provi d es more precise control of h orizontal positions.
ΤΙΜΕ /DIV
Selects the basic swee p rate of the out p ut sawtooth. The V A R IA BLE control must be in cali brated position an d M AG N Ι F Ι E D switch set to Χ 1 for indicated swee p rate .
VAR IA BLE
Two-position switch actuated by the V AR IA BLE kn ob to select calibrated or uncalibrated sweep rates. At the in position, the V AR IA BLE cont rol is inoperative and the sweep rate is calibrated . Wh en presse d an d released , the k nob moves out to activate the V AR IA BLE control fo r uncalibrate d swee p rates . The swee p rate in each ΤΙΜΕ/DIV switch position can be red uced to at least the sweep rate of the next adj acent p osition, to p rovi d e continuously va riable sweep rates from 2 nanosecond s/d ivision ( Χ 10-MAGΝΙ F Ι ΕR on) to about 12 .5 secon d s/ division, with MAG N I FI ER at Χ 1 .
(ΤΙΜΕ /DIV)
M AG NI F I ED
P ush-button switches to select the h orizontal magnification. The Selecte d magnification is indicate d b y α ligh ted bu tton . X1 :Magnified sweep at th e basic sweep rate in d icated by TIME/ DI V switch.
SWP CA L
2-4
V AR IA BLE (amplifier)
Varies d eflectio n factor by α factor of 10.
TEST SETUP C HART General
F ig. 2-3 shows the front p anel of the 71370. Th is chart can be repro d uce d and u sed as α test-setu p reco rd for special measurements, app lications or proced ures, or it may be u sed as α training ai d for familiarization with this instru ment.
G ENER AL OPERATI NG
I NFORM ATIO N
Sweep Calibration Chec k Wh enever the 71370 is inserted into α plug-in compartment ot her than the one in whic h it was calibrated , the sweep calibration should be chec ked an d rea d justed if necessary . Allow five minutes warmup before p erforming this proced ure. 1 . Connect α one- k ilohertz cali brator signal from the Indicator Oscillosco p e Cali brator to the V ertical unit input co nnector . 2. Set th e TI ΜΕ/DIV switch to 1 ms and press the top T R IGG ER I NG and DISPLAY MOD E pushbuttons. 3. Set the V ertical unit to display at least two d ivisions of t he sig n al vertically . 4. Chec k t he CRT display for one complete cycle per
Χ 10 : M agnified swee p at α swee p rate 10 times faster than the basic sweep rate in d icated by the ΤΙΜΕ /DI V switch. Th e portion of th e n ormal swee p with in the center d ivisio n of the graticule is th e po rtion shown in magnified form .
division.
Screwdriver a djustment to set a mplitu d e of t he output sawtooth.
Th e following information is p rovi ded to ai d i n quickly o btaining the correct settings for the 71370 to p resent α
5. If necessary, adj ust th e SWP CA L adj ustment for one com p lete cycle p er division .
Sim p lifie d Operating Instructions
7B70 TEST SET-UP CHART
2-5
Operating Instructions-71370
d is play. The o p erator should b e familiar with the com p lete functio n an d operation of the unit as d escribed in t h is section before using this procedure.
oscillosco pe that h as du al time base capabilities a n d when used with α com p anio n delaying-swee p unit (Α) . Obtain α d is p lay as given in steps 1-5 un d er N ormal Sweep. Then p roceed as follows:
N ormal Swee p. The following p rocedure will p rovide α
1 . P ress the Β STARTS AFTER D EL AY p us h-butto n on the Α time-base.
1 . Select th e TR IGG ER I N G M OD E, CO UPLI NG and SO UR CE whic h fit t he re q uirements of the signal to be d is p layed.
2. Set the indicator oscillosco pe horizontal mo d e to display the Α time base.
stable d isp lay fo r most normal-swee p applications .
2. Turn the LEVEL/S L OPE control to the desired slo p e. 3. If the green TR IG'D light is not on, ad just the LEVEL/S LOPE control thro ughout the range of the selected slope u ntil the TR IG'D light comes on . If the light d oes not come on at any setting of the LEVEL/S LO PE co ntrol, the trigger signal is ina d eq uate or the CO UPL I NG an d SO UR C E switches are set incorrectly . 4. Set the ΤΙΜΕ /DI V switch and POSITIO N control for α display whic h remains on the d isplay area h orizontally (V A R IA BLE control should be in CA L position for cali brate d swee p rates) . 5. If the display does not start at the correct point on the waveform, rea dju st the LEVEL/S LOPE control for the d esired triggering .
Magnified Sweep. Α magnified-sweep d isplay can be obtained as follows after α normal-swee p d is p lay is obtaine d as given in ste p s 1-5 above. 1 . Ad just t he POSITIO N co ntrol to move the area to be magnified with i n t he ce n ter division of the CRT. 2. If necessary, c h a nge the ΤΙΜΕ /DIV switch setting so th e complete area to be magnifie d is within th e center d ivision . 3. Press the X10- MAG Ν 1 F ΙΕ Rpush-button .
3. Set the ΤΙΜΕ /DI V switch of the 71370 so the intensified zone on the dis p lay is the desi r e d lengt h (i ntensifie d zone will b e d isp layed in d elayed form) . If the inte nsifie d zo ne is n ot visible, adj ust the in d icator inte nsity controls . 4. Ad ju st the Α time-base DEL AY TIME MULT d ial to positio n t he inte nsified zo ne to t he portion of th e d isp lay to be delayed . 5. Set the in d icato r oscillosco pe h orizontal mode to display the Β time base (7 Β 70) . 6. If α d elayed swee p with less j itter is desire d , p ress the Α time-base Β T R IGG ER ABLE A FTER D EL AY pus hbutton . The triggeri ng co ntrols of the 71370 must be set to obtain α stable d is p lay.
P us hbutton
Switch Logic
The T R IGG ER I NG M OD E, CO UPLI NG and SO UR CE switches an d t he DISPLAY M OD E switch are arranged i n α sequence whic h p laces the most often-used p ositio n at the top of each series of pus hbuttons . W it h t his arra ngement, α stable normal-sweep d is play can usually be obtained by pressing the top pu sh-buttons ; Ρ-Ρ AUTO, AC, ΙΝΤ and TIME B AS E . When an a d equate trigger signal is applied , the u n it is triggered as ind icated by the illuminate d TR IG'D light at any setting of the LEVEL/S LOPE control. If the TR IG'D light is not on, either the trigger signal ap plied to this unit from the vertical unit is ina d eq uate or it is b elow the lower freq uency limit of the AC CO UPLING switch position. If the desired display is not obtained with t he pushbuttons p us hed in, ot her selections must be ma d e. R efer to the following d iscussio ns or the instruction ma nuals for the associated in d icator oscilloscope an d vertical unit for more information .
4. U se the fi ne range of the P OSITIO N co ntrol to esta blish precise p ositioning of the magnifie d d is p lay.
Triggered
Delayed Swee p . The following p rocedu re can be used to obtain α delaye d-sweep d isplay when the 71370 is used in an
The TR IG'D light p rovi d es α convenie nt in d icatio n of the con d itio n of the triggering circ uits. If the TR IGG ER I NG controls are correctly set and an ad equ ate trigge r
2-6
L ight
O p erating Instructions-71370 Trigger
Mo d e
T h e pus h buttons locate d under t h e M OD E title (see F ig . 2-4) select t h e mo d e in w h ic h t h e swee p is triggered . T h e selecte d mo d e is i nd icated by α lig hte d p us h button .
F ig . 2-4. V iew of fron t pan el showi n g p u sh- bu ttons associated wit h switc h es.
th e M OD E , COUPL I N G an d SO U R C E
signal is a pp lied , t h e T R IG'D lig h t is on . U nd er certain cond itions, t h e T R IG'D lig h t may be off, in d icati n g th at t h e swee p is not triggere d . T h e cause mig h t be α misa d j uste d LEVEL /S L O PE control, incorrectly set CO UPL I N G or SO UR C E switc h es, low trigger signal am p litu d e, or α trigger signal re p etitio n rate outsi d e t h e acce p table freq uency range . T h is feature can be use d as α general in d ication of correct triggering . It is p articularly useful w h e n setting up t h e trigger circuits w h en α trigger signal is available wit h out α d is p lay on t h e C R T . It also ind icates t h at t h is unit is correctly triggere d wh en o p erating as α d elaye d swee p unit ( Β ) .
Ρ - Ρ A U TO . When t h e Ρ - Ρ A U TO p us h button is p ressed , α triggere d d is p lay is p rovid e d at any setti n g of t h e LEVEL / S L O PE control w h enever an ade q uate trigger signal is ap p lie d . T h e range of t h e LEVEL /S L O PE control in t h is mo d e is b etween about 10% and 90% of t h e p ea k -to- pea k am p litu d e of t h e a pp lied trigger signal . T h e LEVEL/S L O PE control can be set so t h e d is p layed waveform starts at any p oint wit h in t h is range on eit h er slo p e . In t h e Ρ - Ρ A U TO mo d e, t h e trigger circuit automatically com p ensates for c h anges in trigger signal am p litude for sig n als above t h e minimum am p litu d e req uirement . T h erefore, if t h e LEVEL / S LO P E control is set so t h e d isp layed waveform starts at α certain p ercentage- point on t h e leading edge of α lowamplitude signal, it triggers at t h e same p ercentage- p oint on t h e lea d ing ed ge of α h ig h -am p litu d e signal if t h e LEVEL / S L O PE control is not c h ange d . T h is o p eration is illustrated in F ig . 2-5 . Wh en t h e trigger repetitio n rate is below about 200 h ertz (or outsi d e th e freq uency range selected b y t h e CO UPL I N G switch ), or w h en t h e trigger signal is inade q uate, t h e swee p free runs at t h e sweep rate indicated by the TIME/DIV switch to p ro d uce α reference trace (T R IG'D lig h t off) . Wh en an ad e q uate trigger signal is again a pp lied, t h e freerunning con d ition en d s and α triggered d is p lay is p resente d . T h e Ρ - Ρ A U TO trigger mo d e is p articularly useful w h en o b serving α series of waveforms, since it is not necessary to reset t h e LEVEL /S L O PE control for eac h observation . Also, because of t h e ease of obtaining α triggered d isp lay in
F ig . 2-5. LEVEL /S L O P E control o p eration for (P-P) A U TO mo d e triggeri n g . ( Α ) LEVEL /S L O PE control set so d isp laye d waveform starts at ab ou t 25% poi n t of α two-d ivisio n waveform . ( Β ) d isp layed waveform still triggered at a bo ut 25% of lead i ng e dge, wh en sig nal amplit ud e i ncreases to p rod u ce α six-division d isp lay (LEVEL/S L O PE co n trol at sa me setting for bot h waveforms) .
Operating Instructions-71370 th is mod e, t h e Ρ - Ρ AU TO trigger mo d e ca n be used for most a pp lications and t h e remaining mo d es used only for s pecial a pp lications or w h en stable triggering is not obtainable in t h is mode .
AUTO . Wh en t h e A U TO pus h -button is illuminate d , α triggered d isp lay is p resented wit h t h e correct setting of t h e LEVEL/S L O PE control (see Trigger L evel discussion) w h enever an a d eq uate trigger signal is a pp lie d . T h e range of t h e LEVEL /S L O PE control in t h is mode is ±8 vertical d ivisions . T h e T R IG'D lig h t in d icates w h en th e disp lay is triggered .
Wh en th e trigger re p etition rate is below about 30 h ertz (or outsi d e t h e fre q uency ra nge selected by t he CO UPL I N G switc h ) or w h en th e trigger signal is inad e q uate, t h e sweep free runs at t h e swee p rate indicate d by t h e ΤΙΜΕ /DI V switc h to p roduce α reference trace (T R IG'D lig h t off) . Wh en an a d eq uate trigger signal is again app lie d , t h e freerun n ing cond ition en ds an d α triggere d disp lay is p resente d . When t h e LEVEL/S L O PE control is at α setting outsi d e th e am p litude range of th e trigger signal, t h e sweep also free runs at t h e swee p rate indicate d by t h e ΤΙΜΕ /DI V switc h . T h is ty p e of free-running d is p lay can be useful w h en it is d esire d to measure only t h e maximum pea k -to- p ea k am p litu d e of α signal with out observing t h e waves h a pe (such as in ban dwi d t h measurements) .
N O RM . Wh en th e N O RM pus h - b utton is p resse d , α triggere d d is p lay is p rese nted wit h h e correct setting of t h e LEVEL /S L O PE control w h enever an a d e q uate trigger signal is a pp lie d . T h e ra n ge of t h e LEVEL /S LO PE control in th is mode is ±8 vertical divisions . Th e T R IG'D ligh t in d icates w h en t h e d is p lay is triggered .
t
T h e N O RM trigger mo d e must be use d to p ro d uce triggere d dis p lays wit h trigger repetition rates below about 30 h ertz . Wh en t h e LEVEL /S LO PE control is at α setting outsi d e t h e am p litu d e range of t h e trigger signal, w h en t he trigger repetition rate is outside th e fre q uency range selected by th e CO UPL I N G switch or w h en t h e trigger signal is ina d eq uate, t h ere is no trace (T R 1G'D lig h t off) . SI N G LE S WP . When t h e signal to be d is p layed is not repetitive or varies in am p litude, wavesh a p e or re p etition rate, α conventional repetitive ty p e d is p lay may pro d uce an u nstable p resentation . Α stable dis p lay can often be o btained under th ese circumstances by usi n g th e single-swee p feature of th is unit . T h e SI N G LE S WP M OD E is also useful to photogra p h non-repetitive or u n stable dis p lays . To obtain α single-sweep d is p lay of α re petitive signal, first o btain t h e best possi b le d is p lay in t h e N O RM M OD E . T hen with out c h anging th e ot h er T R IGG ER I N G controls,
2- 8
press t h e SI N G LE SWP p us h button . Wh en rea dy to view t h e single-swee p d isp lay, p ress t h e RE S E T- RE ADY p ush bu tton . Α single trace is p resented eac h time t h e RE S E TREADY p us h button is pressed (as long as t h e re p etitive sig n al remains connected to t h e system an d T R IGG ER I N G controls are correctly set) an d furth er sweeps cannot b e p resente d u n til t h e RE S E T- READY p us h button is p resse d again . If t h e dis p layed signal is α com p lex waveform com p osed of p ulses of varying am p litude, successive singleswee p d is p lays may n ot start at t h e same point of t h e waveform . To avoi d confusion d ue to t h e C R T p ersistence, allow t h e d is p lay to d ecay before pressing t h e RE S E T- RE ADY p ush button again . At fast swee p rates, it may b e d ifficult to view th e single-swee p d is p lay . T h e a pp are n t trace intensity ca n be increase d by re d ucing t h e ambie n t lig h t level or usi n g α viewi n g hoo d as recommen d ed in t h e i n d icator instructio n manual . Non-repetitive, ran d om signals can b e d is p layed in t h e single-sweep mod e by first obtaining th e best p ossible display in t h e N O R M M OD E wit h α signal w h ic h is about t h e same amp litude an d frequen cy as t h e ran d om signal . T h en wit h out c h anging t he ot h er T R IGG ER I N G controls, p ress th e SI N G LE SWP push button . Wh en rea d y for t h e rand om signal, press t he RE S E T- RE ADY pus h button . T h e RE S E TRE ADY p ush button remains ligh ted to in d icate t h at th e unit h as been reset an d is rea d y to prod uce α swee p . T h e ligh t goes out after t h e ran d om signal triggers t h e unit . To pre p are t h e unit for anot h er single-swee p dis p lay, p ress th e RE S E T- RE ADY push button again .
Wh en usi n g th e single-swee p mode to ph otogra p h waveforms, t h e graticule must b e ph otogra ph ed se p arately in t he normal manner to p revent over-ex posing t h e film . Be sure t h e camera system is well p rotecte d against stray lig h t, or operate t h e system in α d ar kened room . F or repetitive waveforms, p ress t h e RES ET- RE ADY p us h button only once for eac h waveform unless t h e signal is com p letely symmetrical . Ot h erwise, multi p le waveforms may ap pear on t h e film . F or random sig n als, t h e camera lens can be left open until t h e random signal triggers t h e unit ( RE S E TRE ADY p ushbu tton lig h te d ) . F urt h er information on p h otogra p h ic tec h niq ues is given in t h e camera instruction ma nual .
Trigger Cou p li n g T h e p us h buttons located below t h e CO UPL I N G title (see F ig . 2-4) select t h e met h od in wh ich t h e trigger signal is con n ected to th e trigger circuits . T h e selected cou p ling is indicated by α ligh te d p ush butto n . E ach p osition permits selection or rej ectio n of t h e freq ue n cy com p onents of t h e trigger signal w h ic h trigger t h e swee p . F ig . 2-6 gra p h ically illustrates t h e ban d of freq ue n cies covere d by each p osition of t h e CO UPL I N G switch .
Operating Instructions-7 Β70
30 Ητ
}ililiG ε;ιυ~.;~:, AC
~ ". ϊΣ R'., .
ι30 kH z
50 k Hz_
200 ΜΗτ
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σ~σ~σσ~σ~σ::σι: ~τ: .:σ σσ:_ :::σα
DC
10 Ητ
100 Ητ
10 kH z
100 kH z
10 ΜΗτ
100 ΜΗτ
F ig . 2-6. F requency ra nge of each CO UPLING switch position.
AC . Ιη the AC position of the CO UPL I N G switch , the DC component of th e trigger signal is b locked . Signals with 1οω -fre quency com ponents below about 30 hertz are attenuate d. Ιη ge neral, AC CO UPL I NG ca n be used for most app lications. H owever, if the signal contains unwanted frequency components or if the swee p is to be triggere d at α Ιοω re petition rate or DC level, one of the remaining CO UPL I N G switch positions will provi de α better d is play .
The triggering p oint in the AC position d epends υροη the average voltage level of the trigger signal . If th e trigger signal occurs randomly, the average voltage level will vary, causing the triggering p oint to vary also . This shift of the triggering point may be enough so it is im possible to maintain α stable d isplay . Ιη such cases, use DC cou pling.
AC LF REJ. Ιη the AC LF REJ position, DC is rejecte d an d 1οω -fre quency trigger signals below about 30 k ilohertz are attenuated. Th erefore, the swee p is triggere d οηΙγ by the higher-fre quency com ponents of the trigger signal . T h is p osition is particularl y useful for providing stable triggering if the trigger signal contains line-freq uency comp onents . Also, the AC LF REJ position p rovi des the best alternatemode vertical displays at fast svyeep rates when comp aring tωο or more unrelated signals (wit h d ual-trace v ertical or slaved triggering operation for d ual-vertical u nit operation) .
AC HF REJ. The AC HF REJ position p asses αΙΙ Ιοωfrequency signals between about 30 hertz an d 50 kilo hertz . DC is rejected and signals outside the above range are attenuated. Wh en triggering from complex waveforms, th is position is useful for provi ding stable d is play of the Ιοωfrequency components.
DC . DC CO UPL I NG can be used to p rovide stable triggering with 1οω -fre q uency signals wh ic h would be attenuated in the ot her mo des, or with Ιοω-repetitio n rate signals. It εαη also be used to trigger the swee p when t he trigger signal reac hes α DC level selected by the setting of the LEVEL/S LOPE control. Wh en using internal triggering, the setting of the vertical unit posίtion controls affects the DC triggering point . Trigger Source The pushbuttons located b elow th e SO UR CE title (see Fig. 2-4) select the source of the trigger signal wh ic h is connected to the trigger circuits . The selected source is indicate d by α lighted p ush button . σΝΤ. Ιη the ΙΝΤ position of the SO UR CE switch, the trigger signal is derived from the associated vertical unit, Furt her selection of the internal trigger signal may be pro2-9
O perating Instructions-71370 vi ded by the associated vertical unit or i nd icator oscilloscope; see the instructio n ma nuals for these i nstrume nts for information . F or most a pp lications, the ΙΝΤ-SO UR CE position can be u sed . H owever, some ap plications require special triggering whic h cannot b e obtained i n t he ΙΝΤSO UR CE positio n. In such cases L I NE- or ΕΧΤ-SOUR CE must be used .
L I NE . The L I NE positio n of the SO UR CE switch connects α samp le of the power-li ne voltage, to wh ich the ind icator oscillosco pe is connecte d , to th e trigger circuit. L ine triggering is useful when the in p ut signal is time-related (multi p le or su b-multi p le) to the line fre q uency. It is also useful for providing α stable d isp lay of α li ne-freq ue ncy component in α comp lex waveform . EXT. An external signal co nnected to the ΕΧΤ TR IG IN connector ca n be used to trigger the swee p in t he ΕΧΤSO UR CE position. The external signal must b e time-relate d to the d isplayed waveform for α stable d is play. An external trigger signal can be used to pr ovi d e α triggered dis p lay wh en the internal signal is too low in am p litude for correct triggeri ng or co ntains signal com p onents on wh ich it is not desired to trigger. It is also usef ul when signal tracing in amplifiers, ph ase-sh ift networ k s, wave-s haping circ u its, etc. The signal from α si n gle point in the circuit u nde r test can be conn ected to the ΕΧΤ TR IG IN connector throug h α p robe or ca ble. The swee p is then triggered by the same signal at all times an d allows am plitu de, time relationship or waveshape ch anges of signals at variou s p oints in the circuit to be examin ed wit hout resetting the TR IGGER I NG controls. ΕΧΤ - 10. Operatio n i n the ΕΧΤ _ 10 position is the same as d escribed for ΕΧΤ except that the external signal is attenu ated 10 times. Atte nuation of high-am p litu d e external tr igger signals is d esirable to b roa d en the range of th e LEVEL /S LOPE co ntrol . Trigger Slo p e The LEVEL/S LOPE control determi nes whet her the trigge r circuit respon d s on th e positive-going or n egativegoing portion of the trigger signal . Wh en t h e indicator li ne on the outer ri ng of the LEVEL/S LOPE control is to the left of center, the d isplay starts on the positive-going portion of the wavefo r m (notice positive-goi ng waveform to left of control. To the right of ce nter, the display starts on t h e negative-going p ortion of t he waveform (notice negative-goi ng waveform) . The effect of the LEVEL/ S LOPE control on the disp layed waveform is sh ow n i n F ig . 2-7. When several cycles of α signal a ppear in the d isplay, the selectio n of the trigger slope is often unim portant . H owever, if only α ce rtain p ortion of α cycle is to be displayed, correct setting of the LEVEL /S LOPE control is importa nt to pr ovide α d isplay whic h starts on the d esired slope of the input signal . 2- 1 0
Trigger
Level
The LEVEL /S LOPE co ntrol determines the voltage level on the trigger signal at wh ic h t he d isp lay is triggered , as well as selecting the trigger slope. The center knob of the LEVEL /S LOPE co ntrol p rovi d es about α 3:1 reductio n i n relation to the outer in d icator ring, to allow p recise level selection . This co ntrol can also b e t urned th ro u ghout the complete 360° rotation to allow continuous triggering over th e selected slope. This is p articularly useful in t he Ρ-Ρ AUTO M OD E . Wh en the LEVEL/S LOPE control is set to the "Ο" on either the p ositive-goi ng or n egative-goi ng waveform, the swee p is triggere d near the ze ro-volt level of the trigger signal . As the LEVEL/S LOPE co n trol is rotate d away from the "Ο", t he d is p layed waveform starts at α point correspon d ing to the positio n of the i nd icator line on the associated slope waveform (wit hi n am p litu de range of trigger signal except in Ρ-Ρ AUTO M OD E wh ic h p rovi des triggere d d is p lay throug hout enti re slo pe) . F or exam p le if th e LEVEL/S LOPE control is turne d cloc kwise from the "Ο" on the p ositive-going slope, the d isplayed waveform starts at α mo re p ositive level. F ig . 2-7 illustrates the operatio n of the LEVEL/S LOPE co ntrol at d ifferent levels and slopes of α d isp laye d waveform .
B efore setting the triggering level, select t he TR IGG ER I NG SLOPE, M OD E , CO UPLI NG and SO UR CE. Then adjust the LEVEL/S LOPE control so the d isp layed waveform starts at the d esired point. The triggering slope can be changed at any time by rotating the LEVEL/S LOPE control to the correspon d i ng point on t he oth er slope waveform .
H orizontal
Swee p
Rate
The ΤΙΜΕ /DIV switch provides 26 cali brated sweep rates ranging from 0.02 microsecon d /division to five secon d s/d ivisio n. The VAR IA BLE ΤΙΜΕ /DI V co ntrol must be in the cali brated positio n and t he M AG N I F I ER at Χ1 for the ind icated sweep rate . The VAR IA BLE ΤΙΜΕ /DI V control incorporates α two-position switch to d etermi ne if the swee p rate is calibrated or uncali brated. Wh en th e VA R IA BLE kn ob is in the inward position , the V AR IABLE TI ΜΕ /DI V co ntrol is ino perative and t he swee p rate is cali brated . Wh en pressed an d released, the V AR IA BLE kno b moves outwar d to activate the V AR IA BLE TIME/ DI V co ntrol for uncali brated swee p rates. Α calibrated sweep rate can be obtained at any p osition of the V AR IABLE ΤΙΜΕ/DIV control by p ressing in the V AR IA BLE k nob. Th is feat ure is u seful when α specific uncalibrated sweep rate has been obtained and it is d esired to switch b etween th is uncalibrated swee p rate an d α cali brate d sweep rate . Switching from uncalibrated to cali brated operation or vice versa does not affect the setting of the VAR IA BLE ΤΙΜΕ/DIV control. The VA R IA BLE ΤΙΜΕ /DIV co ntrol allows the swee p rate in each ΤΙΜΕ /DI V switch position to be reduce d to at least the swee p rate of the next adjacent switch position . Th is p rovi des an overall uncali brated vari-
F ig .
2-7 .
E ffect of
LEVE L/S L OPE co ntrol on C RT display (A UTO Ρ- Ρ
M OD E ) . 2- 1 1
Operating Instructions-71370 Te n th-vertical li ne
Second-vertical li ne
ιιιιιιιιιι ιιιιιιιιιι ιιιιιιιιιι ιιιιιιιιιι ιιιιιιιιιι ιιιιιιιιιι ιιιιιιιιιι ιιιιιιιιιι Time
EMENEEZEEN MENEEMEMEN MEMENSENEE NOMMUNNOWN
ii 1irrrr
NNEEMENNEE N
EMENEEMENE EMENEEMENE
M easur ement
( Α) Unm agn ified W avefor m
a r ea
F ig . 2-8. Area of graticu le used fo r accur ate ti me measurem e nts .
a b le
EMENEEMEEN EMENEEMENE
sweep rate ra n ge from 20 n a n oseconds/division (from
2 na n oseco n ds/division wit h MAG N I F I ER at Χ 10) to a bout 12.5 seco nds/division.
Wh e n ma k ing time measurements from t h e graticule, t h e area betwee n t h e seco nd -division an d tent h -division vertical lines of t h e graticule provides th e most linear time measureme n t (see F ig. 2-8) . T h erefo r e, t h e first an d last division of th e display area sh ould not be u sed wh en ma k i n g accurate time measurements. Positio n t h e start of t he timi n g area to t h e second vertical li n e (second line from t h e left) and adj ust t h e ΤΙΜΕ/DI V switc h so t h e e nd of t h e timi n g area falls between t h e seco n d-division and ten t h -division vertical lines.
Sweep Magnifier T h e sweep mag n ifier expands th e sweep ten times. T h e center d ivision of t h e unmagnifie d display is t h e portion visible on t h e screen in mag n ified form (see F ig. 2-9). Equivale nt le n gt h of t h e magnified sweep is more t h a n 100 divisions ; any 10-divisio n p ortion can be viewed by adj usting th e h orizo ntal P OSITIO N co n trol to bring the desired portion onto t h e viewing area. T h e dual-ra n ge feature of t h e h orizontal POSITIO N control is p articularly useful w h e n t he M AG N I F I ER is set to Χ 10 (see Horizontal P osition Control discussion w h ic h follows) . To use sweep mag n ification, first move th e portion of t h e display wh ich is to be expanded to t h e center of th e graticule . T h en press t he X10-MAGNIFIER pus h butto n ; t h e Χ 10 button lig h ts to indicate that th e h orizo n tal sweep rate is magnified . Whenever t h e X10-MAGNIFIER push button is lig h ted, t h e e qu ivale n t magn ified swee p rate can be determi n ed by divi d i n g t h e ΤΙΜΕ/DI V switc h setting by 2-1 2
N
MENEEMEMEN ENEENE NONNEEMMON MENNEENEEN NEENEEMENE MENEEMEMEN ( Β ) Mag n ified Waveform F ig .
2-9 . Operation of sweep m agnifier.
10. F or example, if th e ΤΙΜΕ/DI V switc h is set to .05 μs, t h e equivalent magnified sweep rate is 5 na n oseco n ds/ d ivisio n . T h e eq uivalent magnified sweep rate must be u sed for all time measureme n ts w h en t h e X10-MAGNIFIER button is lighted . The equivale n t magnified sweep rate is calibrated wh en t h e VA R IA BLE ΤΙΜΕ/DI V control is i n t h e calibr ate d position . Horizontal Position Control
T h e 71370 provides bot h fine and coarse ad j ustment of positioning. T h e coarse adj ustmen t provides rap i d h orizo n tal positio n ing of t he trace. F i n e positioning is provi ded for more precise control of trace position . Dis play Mode
Time- Base. W ith t h e DIS PLAY M OD E switc h in th e TIME B AS E positio n th e 71370 fu nctions as α nor mal timebase with t h e sweep rate set by t h e ΤΙΜΕ/DI V switc h .
Operating Instructions-71370 Amplifier. 1 η some a pp lications, it is desirable to d is p lay one signal versus anot her (X-Y) rath er th an against time. The AM PL I FI ER position of th e DISPLAY MOD E switch provid es α means fo r a p plying an external signal to the h orizontal amplifier for this type of display. The correct CO UPL I NG an d SO UR CE must be selected to correspon d to the signal app lied to the ΕΧΤ VO LTS IN connector.
J ohn F . R id er a nd Seymour D . U slan, "Encyclopedia of Cathode- Ray Oscillosco p es an d T hei r Uses", John F . R i der Publisher I nc ., N ew York, 1959 .
Two modes of external h orizontal operation are pro vi ded. Wh en the SO UR C E switch is set to ΙΝΤ, the h orizontal deflection is provi d ed by α signal applied to the vertical amplifier . In the ΕΧΤ an d ΕΧΤ - 10 positions of the SOUR C E switch , external horizontal deflection is p rovi de d by the signal applied to the ΕΧΤ VO LTS IN co nn ector. The signal coupli ng provide d by the CO UPLI NG switch can b e used to select or reject components of the external h orizontal sign al .
Ru fus Ρ. Turner, "Practical Oscillosco p e H and boo k", Volu mes 1 and 2, J ohn F. R ider P ublisher Inc., New York, 1964.
The external horizontal deflection factor (with Amplifier VAR IA BLE fully cloc kwise) is approximately 25 millivolts per d ivisio n in t he ΕΧΤ position of th e SO UR C E switch and a pp roximately 250 millivolts per division in t he ΕΧΤ = 10 position of the SO UR CE switc h.
APPL ICATIO NS General
T he following informatio n describes the p roce dures an d techn iques fo r ma king basic measurements with α Te ktronix 7700-.eries Oscillosco p e. These app lications are not d escribe d in detail, since each a pplication must be ada p ted to the req uirements of the individual measurement. This instrument can also be used fo r ma ny app lications not d escr ibed i n t his m anual . Contact your local Tektron ix Fiel d Office or represe ntative for assistance in making specific measurements. Also, the following books d escribe oscillosco pe measurement tech ni ques whic h can b e adapted for use with th is inst rument: Harley Carter, "An I ntrodu ction to the Cath od e R ay Oscillosco p e", Ph ilips Technical L ibra ry, Cleaver- H ume P ress L td ., L on d on, 1960 . J . Czec h , "Oscilloscope Measu ring Techn i q ue", Ph ili p s Tech nical L ibrary, Springer- Verlag, N ew York, 1965 . R obert G . M idd leto n and L. Donal d Pay ne, " Usi ng the Oscilloscope in I ndustrial Electro nics", H owar d W. Sams & Co . Inc., The Bobbs- Merrill Com p any Inc., India naοolis, 1961 .
Oi
J ohn F . R ide r, "Obtaining and I nterpreting Test Sco p e Traces", John F . R i d er Publis her Inc., N ew Yo rk, 1959 .
F requency Comparison Sweep Rates . To esta blish an ar bit rary h orizontal sweep rate based upon α specific refe rence frequ ency, p roceed as follows: 1 . Connect the reference signal to the vertical I NPU T co nn ector. Set the VOLTS/ D I V switch for four or five d ivisions of vertical deflection . 2 . Set the ΤΙΜΕ /DI V switch a nd the VA RIA BLE ΤΙΜΕ /DI V control so one cycle of the signal covers an exact number of h orizontal d ivisions. Do n ot change the VAR IA BLE ΤΙΜΕ /DIV control after obtaining the desired deflection. This display can b e used as α reference for frequency comparison measurements . 3. To establis h an ar bitrary sweep rate so th e re p etition rate of an un kn own sign al can be measured accurately at any setting of t he ΤΙΜΕ/DIV switch , the repetition rate of th e refere nce sig n al must be k nown. If it is n ot k nown, it can be measure d before th e VAR IA BLE ΤΙΜΕ/DIV switch is set in step 2. 4. Divide the re petition rate of th e refere nce signal (secon d s) by t he p roduct of t he h orizontal deflectio n established in step 2 ( d ivisions) an d t he setting of the TIM Ε/DIV switch. Th is is the h orizontal conversion factor :
H orizontal
Conve rsion = F actor
reference signal r epetitio n rate (secon d s) h orizontal ΤΙΜΕ /DI V deflection ( d ivisio ns)
χ
switch setting
5. To measure the re petitio n rate of an u nkn ow n signal, d isco nn ect the reference signal and connect the u nkn own
signal to the I N PU T connector. Set the ΤΙΜΕ/DIV switch to α setting that p rovides sufficie nt horizon tal deflection to ma ke an accurate measurement. Do not rea djust the VAR IABLE ΤΙΜΕ /DI V control . 2- 1 3
Operating Instructions-71370 6 . Measu re t h e horizontal deflection i n divisions and calculate t h e repetition rate of t he un known sig nal usi n g t h e following formu la : Repetitio n = Rate
ΤΙΜΕ /DI V switch χ setti n g
h o rizon tal h orizontal co nversio n χ deflection facto r ( d ivisio n s)
ΝΟΤΕ If the h orizontal magnifier is used, be sure to use the magnified sweep rate in place of the TIMEIDIV switch setting. Example . Assume α reference signal freq u e n cy of 455
(repetition rate 2 .19 milliseconds), α ΤΙΜΕ /DI V switch setting of .2 ms, a nd h e V A R IA BLE ΤΙΜΕ /DI V co ntrol ad j usted to provide α horizontal deflectio n of eigh t divisio n s. Substituting th ese values in th e horizo n tal conversion factor formula (step 4) : h ertz
t
Ho r izontal Conversio n = F acto r
2 .19 milliseco nds .2 Χ 8
= 1 .37
Th e n, with α ΤΙΜΕ /DI V switc h setting of 50 μs, th e repetitio n rate of an un known signal w h ic h completes one cycle i n seven h orizontal divisions can be determined by using th e repetition rate formula (step 6) : R epetition
Rate
__
measuremen t poi n ts (see Fig . 2-8) . (See t h e to p ic en titled Horizontal Sweep Rate in th is section concerning nonlinearity of first a nd last divisio n s of α disp lay .) 6. Adj ust t h e vertical POSITIO N control to move th e points between w h ic h th e time measureme nt is ma d e to t h e ce n ter h orizontal reference li n e. 7 . A dj ust t h e horizo n tal POSITIO N co n trol to position t h e time-meas u reme n t poi nts wit h i n h e center eigh t divisio n s of t he graticule .
t
8 . Measure t h e h o r izontal dista nce between th e time measureme nt points. Be sure t h e Α V A R IA BLE co n trol is set to CA L . 9 . Multiply t h e distance measured in step 8 by t h e setting of th e ΤΙΜΕ /DI V switch . If sweep magnification is u se d , divi d e th is answer by 10 .
t
E xample . Assume t h at th e distance betwee n h e time measurement poi n ts is five divisions (see Fig . 2-10), and th e ΤΙΜΕ /DI V switch is set to .1 ms wit h t h e magnifier to X1 . Using t h e form u la : h orizontal
Time Duration =
50 μ s Χ 1 .37 Χ 7 = 480 μ s
ΤΙΜΕ /DI V distance Χ setti n g (d ivision s) magnification
T h is a n swer can be converted to f r equency by ta k ing t h e reci p rocal of t h e repetitio n rate (see ap p lication on Determi n i n g Frequency Measu r ements) . Time-Duration Measurements To measure time between two points on α waveform, use th e following procedu re : 1 . Co n nect t h e signal to eit her Vertical pl u g-in . 2 . Set th e MOD E switc h to display t h e plug-in used . 3 . Set th e V O LTS/DI V switch to disp lay about four divisions of t h e waveform . 4 . Set t h e 71370 triggering co n trols to obtain α sta b le display . 5 . Set th e ΤΙΜΕ /DI V switch to t h e fastest swee p rate t h at displays less t h an eig h t divisions between h e time
t
2- 1 4
EMMEEMEM Emmons moons M MEMMMUMMON . -Hc distance
ι ι Ce nter meas ure ment area -------0-11 ι Fig . 2-10 . Measu ri ng th e time duratio n b etween points on a wavefor m .
O pe rating Instructions-71370 6 . Set t h e ΤΙΜΕ/DI V switch to t h e fastest sweep rate th at displays less t h a n eig h t divisions between th e 10% a nd 90%ο poi n ts on t h e wavefor m .
Su bstituti n g t h e given val u es : 5 Χ 0 .1 ms 1
Time Du ration =
7 . Determine the 10% an d 90% points on th e risi ng po r tio n of t h e wavefo rm . T he figu res give n in Ta b le 2-1 ar e for th e points 10% up f rom th e start of t h e risi n g portion and 109/6 from th e to p of th e rising portio n (90% poi nt) .
T he time duratio n is 0 .5 millisecon d s . Determining F requency T he time measu reme n t tech ni que can also be used to determine th e fre q uency of α sig n al . T h e freq u ency of α periodically recu rrent sig n al is t h e reci pr ocal of t h e time du ration (period) of o n e com p lete cycle . Use t h e followi n g proced ure : 1 . Measure th e ti me duratio n of one complete cycle of t h e waveform as descri bed n th e previous application .
i
2 . Tak e t h e reciprocal of t h e time du ration to determi n e th e frequency .
i
E xamp le. Th e fre q uency of th e sign al s h ow n n F ig . 2-10 w h ic h h as α time duratio n of 0 .5 milliseco n ds is :
Freq uency =
time d u ration
0.5 ms
=
2 k iloh ertz
R isetime Measu rements R isetime measurements employ basically t h e same tec h ni qu es as time-du ration measu rements . T he mai n difference is t h e points between wh ich t he measurement is made. T h e following procedure gives t h e basic met h od of measuring risetime betwee n t h e 10%ο a nd 90%ο points of th e waveform . F alltime can be measu red in t h e same ma nn er on th e t raili n g ed ge of th e waveform . 1 . Co nn ect t h e signal to either Vertical plug-in .
TABLE 2-1 Risetime Meas u rements
Vertical d is p lay (divisio n s)
10%ο a n d 90% points
Divisions vertically between 10% a n d 90% poi nts
4 5 6
0 .4 a n d 3 .6 divisio n s 0 .5 and 4 .5 divisions 0.6 a n d 5 .4 divisions
3 .2 4 .0 4 .8
8 . Adj ust th e h or izontal POSITIO N co ntrol to move t h e 10% point of t h e waveform to th e center measu reme n t area . For examp le, with α five- d ivisio n display as shown in Fig . 2-11, t h e 10% point is 0 .5 divisio n up from t h e sta r t of th e risi n g portio n . 9 . Measur e th e h or izo n tal dista n ce between ίhe 10%ο and 90%ο points . B e sure t h e Α VA R IA BLE control is set to CA L . 10. Multiply t h e distance meas u red in step 9 by t h e setting of t h e ΤΙΜΕ /DI V switc h . If swee p magnificatio n is used, divide t h is a n swer by 10 .
Example . Assu me t h at th e h orizontal distance between th e 10%ο a nd 901/o points is th ree divisio n s (see F ig . 2-11) a nd th e ΤΙΜΕ/DI V switc h is set to 1 μs with the MAG switch set to Χ 10 . Applyi n g th e time duration form u la to risetime :
2 . Set th e MOD E switc h to display th e plug-i n used . 3 . Set th e V O L TS/DI V switc h a nd th e V A R IA BLE control to pro d uce α signal an exact num b er of divisions in amplitude.
h or izo ntal
Time Duration _ ( R isetime)
ΤΙΜΕ /DI V distance Χ setti n g (divisions) mag n ificatio n
Substit uti n g th e given values : 4 . Center t h e display a bout th e cen ter h orizo ntal li ne wit h th e vertical POSITION control . 5 . Set th e Triggeri n g co ntrols to obtai n α sta b le disp lay .
Risetime =
3 Χ 1 μs 10
T h e risetime is 0 .3 microsecond .
2- 1 5
Operating Instructions-7B70 DEL AY TIME MULTI PL I ER d ial settings =
EMEMEEMEME
1
MEN Ι Ι
Ι
Ι Ί ~10% -i Point ; l l Horizontal dista nce
No NMI
l Ι
Ι
,
.. ..
.
NOMMENNONE ////EE "ER/ ίιιiιiEE """/ E
ιιιι ~ιιι F ig . 2-12 . Measuring ti me difference u si ng delayed swee p.
F ig . 2-11 . Measu ri ng risetime .
ΝΟΤΕ
Delayed Swee p Time Measureme nts
T he delayed swee p mode can be used to make accurate
time measurements . The following measurement determines the time d ifference b etween two pu lses d is played on the same trace. Th is application may also be used to measure time d iffere nce from two d ifferent sources (dual-trace) or to measure time duration of α si ngle pulse . See Sectio n 1 for measureme nt accuracy . 1 . Connect the signal to either vertical p lug-in . Set the Indicator Oscillosco pe vertical MOD E selector to d isplay the plug-in being used. Set th e h orizontal MOD E selector to CHOP or ALT (see Oscillosco pe Manual d iscussion on horizontal mode switching) to d isplay both Time-Base swee ps. 2. Set the V OLTS/DI V selector to produce α d isplay about three divisions in am plitude (see F ig . 2-12) . 3. Set the Α ΤΙΜΕ /DI V to α sweep rate wh ic h displays about six d ivisions between pulses. Ad just the A Triggering controls for α stable d is p lay.
Do not change the Α LEVEL control setting or the h orizontal POSITION control setting in th e following steps, as th e measuremen t accuracy will be affected.
6. Turn t he DELAY-TIME MULTI PL I ER d ial to move the intensifie d portion of the Α sweep to the first pulse .
7 . Adj ust the DELAY-TIME MULTI PL I ER dial to move the pulse (or rising portion) of the Β swee p to the center vertical line . Note the setting of the DELAY-TIME MULTIPL I ER dial .
8. Turn the DELAY-TIME MULTI PL I ER d ial cloc kwise until the second pulse is positioned to this same poi nt (if several p u lses are d is playe d, observe the intensifie d portion of the Α swee p to locate the correct pulse) . Agai n note the d ial setting.
selector to Β
9. Su btract the first dial setting from the second and multiply b y the delay time s how n by the Α ΤΙΜΕ /DIV selector . This is the time interval between the pulses.
5. Set the 71370 ( Β ) ΤΙΜΕ /DI V to α setting 1/100 of the Α ΤΙΜΕ /DI V sweep rate. Th is p roduces an inte nsified portion about 0.1 d ivision in lengt h.
E xample : Assu me the first dial setting is 2.23 and the seco nd dial setting is 7.73 with t h e ΤΙΜΕ /DIV set to 5 μs (see Fig . 2-12) .
4. Set the Α Time- Base Β DEL AY STARTS AF TER D EL AY .
2- 1 6
MOD E
Operating Instructions-71370 U sing th e formu la :
EMENEEMEME
Time Difference (delayed sweep) second d ial setting
d elay time first dial Α ΤΙΜΕ /DIV setting Χ ( setting)
Su bstituting the given values : Time Difference = (7 .73 - 2 .23) Χ 5 μs. The time d ifference is 27 .5 microseconds Delaye d Swee p Magnification The d elayed sweep feature can b e used to provid e h igher ap parent magnification th an is p rovided b y the MAG switch . The sweep rate of the D EL AY ED SWEEP (71370) is not actually increased; the ap parent magnification is the result of delayi ng the Β swee p an amou nt of time selected by the Α ΤΙΜΕ /DI V switch and the DELAY-TIME MULTIPL I ER dial b efore th e d is play is presented at the swee p rate selected by the Β ΤΙΜΕ /DI V switch. The following method uses the Β STA RTS AFTER DELAY position to allow the d elayed portion to be positio ned with t he DELAY-TIME MULTI PL I ER dial . If there is too much j itter in the delayed d isplay, use the Triggered Delayed Sweep Magnification_ p rocedure. 1 . Connect the signal to either vertical plug-in. Set the I nd icator Oscilloscope vertical MOD E selector to display th e plug-i n used a nd the horizontal MOD E to CHOP or AL T to disp lay both Time-Base swee ps. 2. Set the V OLTS/DI V selector to produce α d isplay about three divisions i n amp litu de. MOD E
selector to Β 3. Set the Α Time-B ase Β D ELAY STARTS A FT ER DELAY . Adjust the Α Triggering co ntrols for α stable d isplay . 4. Set the Α ΤΙΜΕ /DI V to α swee p rate wh ich displays the complete waveform . 5. Position t he start of the intensified portion with t he DELAY-TIME MULTI PL I ER dial to the part of th e d is play to be magnified . 6. Set the 71370 ΤΙΜΕ/DIV to α setting wh ic h inte nsifies the full portion to be magnifie d. The start of the intensified trace remains as positioned a bove. Α
NNENNEEN NEENNEENNE ENEENEENNE
:J ""ΕΕ"""
EMENEENEEN
F ig . 2-13 . U sing delayed swee p for swee p magnificatio n.
7 . Time measurements ca n be ma de from the display in the co nventional ma n ner. Swee p rate is d etermi ned by the setting of the 71370 TI ΜΕ/DIV selector . Example : The apparent magnification of the display shown in Fig . 2-13 with an Α ΤΙΜΕ /DIV setting of .1 ms and α Β ΤΙΜΕ /DI V setting of 1 μs is :
Appa rent Mag nificatio n (Delayed Sweep)
Α ΤΙΜΕ /DIV setting Β ΤΙΜΕ /DIV setting
Su bstituting the give n values : Apparent
Magn ification
1 Χ 1o--'_ 1 Χ 10-6
100
The apparent magnificatio n is 100 times. Triggere d Delayed Sweep M agnification . The delayed sweep magnification method j ust described may produce too much jitter at hig h apparent magnification ra nges. The Β TRIGGERABLE A F TER DELAY position of the Α Time- Base Β D EL AY MOD E selector provides α more stable display, si nce the delayed d is play is triggered at the same point each time . 1 . Set up the d is play as given in steps 1 through 6 above. 2. Set the Β D ELAY ABLE AFTER DELAY .
MOD E
selector to Β TR IGG ER -
2- 1 7
Op erating Instructions-71370 3. Ad just the Β LEVEL S LOPE control so the intensifie d portio n on the trace is stable . 4. Inability to in tensify the d esired portion indicates th at the 71370 Triggeri ng controls are incorrectly set or the signal d oes not meet the triggering requirements. If th e cond ition ca nnot be remedied with the Β Triggering co ntrols or by increasing the d is play amplitu de (lower V OLTS/DIV setting), trigger the Β sweep externally . 5.
a bove .
Measureme nt
and magn ification are as descri bed
Displaying Complex Signals Using Delayed Swee p Com plex signals often co nsist of α number of in divid ual events of d ifferi n g amplitudes . Si nce the trigger circuits are sensitive to ch anges in signal amplitu de, α stable display can normally be obtained only when the swee p is triggered by the event(s) having the greatest am plitu de. H owever, this may not pro duce the d esired display of α lower-am plitude portion wh ich follows the trigge ring event. The delayed sweep feature provides α mea ns of delaying the start of the Β sweep by α selected amou nt following the event wh ich triggers the Α Swee p. Then, the part of the waveform wh ich co ntains th e i nformatio n of interest can be displayed . U se the following proce d ure :
1 . Set up the display as given in Delayed Sweep cation Steps 1 throug h 6.
Magnifi-
2 . Time measurements ca n be made from the display in the conventional manner . Sweep rate is determined b y the setting of the 71370 ΤΙΜΕ /DI V selector .
Example . F ig . 2-14 shows α com plex wavefo r m as d isplayed on the CRT . The i ntensified p ortion of the waveform ca nnot be viewed in any greater detail b ecause the swee p is triggered b y the larger amplitu de pulses at the start of the d is play an d α faster sweep rate moves th is area of the waveform off the viewing area . The seco nd waveform shows the area of i n terest magnified 500 times using Delayed Sweep. The DELAY-TIME MULTI PL I ER d ial has b een adj usted so the d elayed swee p starts j ust b efore the area of interest .
P ulse J itter Measurements In some applications it is necessary to measure th e amount of j itter on the lead ing edge of α pulse or j itter between pulses. 1 . Set up the display as in t he above procedure . 2. Set the Β D EL AY MOD E selector to Β STARTS AFTER DELAY . Slig ht readjustme nt of th e Β Triggeri ng LEVEL control may be necessary to produce as stable α display as possible . 3. Pu lse j itter is show n by horizontal movement on the pulse (take into account inh erent j itter of Delaye d Sweep) . Measure the amount of horizontal movement . B e sure bot h VAR IA BLE ΤΙΜΕ /DIV controls are set to CA L. 4. Mu ltiply the d ista n ce measu red in step 3 b y the Β ΤΙΜΕ /DI V switch setting to obtain pulse j itter in time. E xample. Assume that the horizontal movement is 0.5
d ivision (see F ig . 2-15), and the Β ΤΙΜΕ /DI V switch setting is .5 μs.
MENNEEMMEM
Nlιττ m τ-"ττ111τ1ι . Βαα d αα 02rτrττ α 2 α ,Mt, α 0@ αα
NEENEENEEM
1
..
ιι ιι """ι
""""""""" E
N
E
MEEMMMMMMM
F ig . 2-14. Displaying α comp lex signal usi ng delayed sweep.
2- 1 Ι3
MNEMMMMMMM MENNEENNE F ig . 2-15 . Measur ing pulse j itter.
O perating Instructions-71370
NEENEENE
MMMMMENEW ~, ~ι. ~~ ι,
pow
r
ί
M pApdp =4M M Rffim Ι ι ~ι ιιί _ Ι 1 I
F ig . 2-16 . Χ- Υ display showing phase shift.
f
R
Ι Ι
d
ho rizontal J itter =
,
FE- Α ---0-A
F ig . 2-17 . Ph ase iffere nce measuremen t from an Χ-Υ display.
U sing the formula :
P ulse
,
jitte r
Χ
(divisions)
Β ΤΙΜΕ /DIV setting
3. Connect the same signal to b ot h ΕΧΤ VOLTS IN connectors . U se the Amplifier VAR IA BLE co ntrols to obtain α d is p lay less than 8 d ivisions vertically and less than 10 d ivisions h orizontally. M easure and record the inherent p hase shift for the oscilloscope system being used . See F ig . 2-16.
Substituting the given values:
4. Connect the Υ signal to the 71370 in the vertical compartment and th e Χ signal to the 71370 in t he h orizontal compartment.
Pulse J itter = 0.5 Χ 0.5 μs The pulse j itter is 0.25 microseconds . Χ-Υ Ph ase
Measurements
T he Χ-Υ ph ase measurement metho d can b e u sed to measure the ph ase d iffere nce b etween two sig nals of the same freq uency. In this mode, one of th e si ne-wave signals pr ovides h orizontal d eflection (Χ) while the ot her signal provi des the vertical d eflection (Υ). T he phase angle between th e two signals can be d etermined from the lissajous pattern as follows : 1 . P lace one 71370 in the h orizontal comp artment an d a not her 71370 (or α vertical unit) in t he vertical compartment of the oscillosco pe.
2. Set both 71370 co ntrols as follows: DISPL AY MOD E CO UPL I NG SO UR CE
AMPL I F I ER AC ΕΧΤ
5. Center the display in relation to the vertical graticu le line . M easure the d istances Α and Β as shown in F ig . 2-17 . Distance Α is th e h orizontal measurement betwee n t h e two poi nts where th e trace crosses the center h orizontal reference li ne. Distance Β is the h orizontal width of the d isplay . 6. Divide Α by Β to obtain t h e sine of th e ph ase angle betwee n t he two signals. Obtain the ph ase angle from α tr igonometric table and subtract th e inherent p hase shift to obtain the actual p hase difference . E xam p le. T he phase angle show n in F ig . 2-16 is a pproxi-. mately 2° an d in F ig . 2-17 the p hase angle is 18° . Measured Ph ase Angle 18°
-
In herent Ph ase
Actual Ph ase
Sh ift 2°
Angle 16°
2- 19
71370
S E CTION 3
CI R C U IT D E SCR IP TIO N Ch ange information, if any, affecting th is section will be fo u n d at th e rear of th e manual.
Introduction This section of the manual contains α d escri p tion of the circuitry used in the 71370. Detailed block diagrams are used to show the interconnections between the stages in each major circuit an d the relationshi p of the front-panel controls to the indivi d ual stages . Α complete bloc k d iagram is locate d in the Diagrams Section at th e rear of th is manual . This diagram shows the overall relationship between all of the circuits . Complete sc hematics of each circuit are also given in the Diagrams Section. R efer to these diagrams throug hout the following circuit d escri ption for electrical values and relationship .
General
BL OC K DIAG RAM
The following d iscussion of the bloc k d iagram at the bac k of th is manual is provided to aid in un d erstan d ing the
overall concept of the 71370 before the individual circuits are discusse d in d etail . E ac h bloc k re p resents α major circuit with in th is instrument .
The selection of I NTERN AL or E XT ERN AL triggering is ma d e in the Trigger In put circuit. This stage also sets the gain and DC balance of th e external trigger in put . To increase the range of the external trigger in put, α 10Χ attenuator networ k is incor p orated in the in p ut of the external trigger am p lifier . The Trigger Am p lifier circuit provi d es am p lification an d waveshap ing of the selected in put trigger signal . L evel ce ntering, slope selection and cou p ling controls are contained in th is circuit. The Pea k Detector p rovi d es the logic necessary for Ρ-Ρ AUTO mode operation. The pea k sensing circuits set the range of the LEVEL control to allow triggering over most of the range of the in put signal . Th is circuit contains level, mo d e, cou p li ng an d source controls . The Trigger Generator circuits p rod uce an output pulse whic h initiates the swee p signal p ro d uce d by sweep generator circuits . The sweep gate multivibrator p roduces α Sweep
Gate for use by the ind icator oscillosco p e. The brig ht-line auto feature wh ich p rovi d es α free-running trace in the absence of triggering signals is contai ned in this stage. The TR IG'D light is also connecte d to the b right-line auto circuit to indicate th e pr esence of α trigger signal . The Sweep Generator circuit p ro d uces α linear sawtooth outp ut signal when initiated by the trigger generator . The slo p e of the sawtooth produced by the sweep generator is controlled by the ΤΙΜΕ /DI V switc h setting . The o p erating mode of the sweep generator is controlled by the T R IGG ER I NG MOD E switch . In th e Ρ-Ρ AUTO an d A UTO p ositions, the absence of α trigger signal causes the swee p to free run. In the N ORM p osition, α h orizontal sweep is initiate d only when triggere d by an adequ ate trigger signal . The SI NGL5 SWEEP position allows only one sweep to be initiated after the circ uit is reset with t he RE S ET button or by the remote reset control . The H orizontal P ream p is α single-ende d to push-pull am p lifier . The output of the sweep generator circuit is amplified by this circuit to p roduce h orizontal deflection for the oscillosco pe. This circuit contains α 10 times magnifier to increase the sweep rate ten times in any ΤΙΜΕ /DI V switch setting. H orizontal p ositioning is incor p orated in this stage.
D ETAI LE D CI RCU IT D E SC R IPTION
General
The following circuit analysis is written arou nd t he detailed block diagrams wh ich are given for each major circuit . These detaile d bloc k d iagrams give the names of the in d ivi d ual stages within th e maj or circuits an d show how they are co nnected togeth er . The bloc k diagrams also show the in p uts and outputs for eac h major circuit and the relationsh i p of the front panel controls to the ind ivi d ual stages . The names assigned to the individual stages on the detailed bloc k d iagrams are used t h roug h out th e following d iscussion . TR IGG ER
I NPUT
In p ut Source The internal trigger signal from the vertical deflection system is coupled directly throug h th is stage to th e trigger amplifier . Th e external trigger signal can b e AC or DC
Circuit Description-71370
εχτ =l ο
εχΤ
ΙΝΤ
Ο Α 20
IN TERNAL T R IGG ER IN Β20>
ΟΤ4 -Ο 10 Ι
OT-0-0
Ι Ο -15 V
Κ48
-15 V Ψ
κ 44
-15 V Ρ
Κ6 Ο
ΕΧΤ T RIG It .
or ΕΧΤ V OLTS IN
ίrτ -'s
TO
T RIGG ER A MPLIF IER
ΕΧΤ '-" 10 ΑΤΤΕΝUATOR Κ3 Ο
-15 V
DC
F ig . 3-1 . Simplified block diagram of the trigger inpu t.
T R IGG ER AMPL I F I ER
coupled to the external in p ut am p lifier . See F ig . 3-1 for α simplified bloc k diagram of the Trigger In p ut Stage .
E xternal In p ut Am plifier T he external signal is converted from single-e n d ed to push-pull by p ara p hase amplifier, Q20A an d Q20B . The gain of th is am p lifier is set by R 25 for α push-pull gain of 0.2 . R 37 is used to DC balance the output an d is ad j usted for α voltage null between the push-pull output lines. Α divide-by-10 attenuator networ k in the in p ut to th is amplifier can b e selected by th e front panel ΕΧΤ =10 p us hbutton to extend t h e triggering level range of the unit . 3-2
General
T he Trigger Amplifier circuit p rovi d es slope and level selection of the trigger signal a pp lied to th e Trigger Gene r ator. The Ρ-Ρ AUTO featu re is also incorp orated in th is circuit . Other controls p rovid e d in th is circuit are AC LF REJ, DC, AC HF REJ an d L I NE T R IGG ER I NG SO UR CE . F ig . 3-2 sh ows α d etaile d b lock d iagram of the Trigger Am plifier circuit. Α schematic of this circuit is shown on d iagrams 2 and 3 at the back of th is manual .
Circuit Description-71370
AMPL I F I ER VA R IA BLE
AC HF REJ
T R IGG ER
INPU T
INPU T STAG E Q707, 0108, 0110
h0.
0131, Q134
IN
Q116, Q120, Q126
0 --
0
0
0 i 0
S L O PE CO MP A R ATO R Q150, Q156, 0158,
+ Ι'-0 _
Q159, 0161, Q168 Q169
TO T R IGG ER
G ENER ATOR
LINE
Γ PEAK DE T E CTO R 0220, Q221, 0224 Q235, 0236, Q238 Q248, Q255, U260 U267
/
Ι /
Ρ- Ρ A UTO
AC LF REJ
LEVEL/S L O PE
DC
F ig . 3-2 . Sim plified
b lock d iagram of trigger am p lifier.
Input Stage
T h e trigger signal (internal or external as selected by th e SO UR C E switc h ) is applied push-pull to th e bases of Q107 and Q108 . Impedance compensating networ k s R 100, C100, L100 and R101 at th e base of Q107 and R104, C104, L104 and R 103 at th e base of Q108 provide α 50 o h m in put for t he trigger signal . Q126 with α voltage divider network R 126, R 127, R 128 provides α DC reference level for Q116 . Q120, R119, R120, R121, R122 and th e output of th e pea k detector circuit provides α variable voltage source fo r Q110 . R121 is ad j ustable to DC balance th is stage wit h h e LEVEL control set to 9 :00 o'clock (centered on t h e positive slope) . Q110-R111 and Q116-R117 provide th e current source for Q107 and Q108 respectively .
t
t
T h e AC HF REJ control, located in h e output of t h e cascode In p ut Stage, en gages C138 to provide attenuation of sig n als a b ove 50 kH z .
Pea k Detector
t
T h e triggering level, with h e MOD E switch set to Ρ-Ρ A U TO, is controlled by t h e Pea k Detector stage . T h e signal from th e trigger am p lifier input stage is app lied to th e Pea k Detector pea k se n sing networ k . T h e output of t h e Pea k
Detector sets t h e voltage ap p lied to th e LEVEL control ( R 146A) so t h at th e range of th e LEVEL control corresponds to t h e peak -to-pea k am p litude or less of th e input signal . The positive portion of t h e input signal is inverted by t h e trigger in put stage a n d applied h rough CR 210 to th e peak se nsing networ k , C210 c h arges to th e pea k value of th e input signal . T h e signal is am p lifie d by Q220-Q224 an d a p plied to the gate of source follower Q248 . Curr ent th rough Q248 decreases and h e voltage at th e wiper of R251 becomes more negative . T h is n egative-goi n g sign al is i n verted by operational am p lifier U260, and a p plied to th e top of t h e LEVEL control, R 146 Α .
t
t
At th e end of th e positive i nput signal t h e voltage at th e source of Q248 rises at α rate determined by C248 and R241 . Th e feedbac k from th e source of Q248 aids in holding t h e ch arge on C210 . F or sig n als wit h α repetition r ate of a b out 200 h ertz or greater, t h e pea k sensing networ k will remain c h arged to th e pea k level of t h e i n put signal .
The negative portion of the input signal is applied inph ase to th e Pea k Detector . T he operation of t h e peak
3-3
Circu it Description-71370 sensing networ k is the same as that described fo r th e pea k positive se nsing networ k . The output at the source of Q255 is a p plied to the bottom of LEVEL control R 146Α as α negative-going voltage whic h represents the peak negative value of the signal in p ut .
MOD E , CO UPL I NG and SO UR CE controls are i nclu d e d in the output stage of the Peak Detector . Slo p e Comp arator The Slo pe Com parator is the electronic e q uivalent of α double-p ole d ouble-th row switch. W ith the SLOPE switch set for p ositive slope triggering, Q158-Q159 are on an d Q161-Q168-Q169 are off. F or negative slope triggering, Q161-Q168-Q169 are on and Q158-Q159 are off. R 155 adjusts the n egative Ρ-Ρ AUTO triggering when the LEVEL/ SLOPE control is set to the negative slo p e.
Output Stage The output of the slope com parator is applied th rough t he Output Stage to the trigger generator circuit. Dio d es CR 181 an d C R 182 limit the push-pull output of th e trigger amp lifier to about one volt peak-to- p ea k.
D ELAY
T R IGG ER
G ENER ATO R
Trigger P ulse Generator The Trigger Pulse Generator (see F ig . 3-3) shapes the out p ut of the Trigger Am p lifier to provi d e α trigger p ulse with α fast leading e d ge . Tunnel d iod e VR 304 is q uiesce ntly in its low-voltage state . The signal from the Trigger Am p lifier switches it to its h ig h-voltage state causing α negativegoing fast rise p ulse at the base of Q317 and α p ositivegoing p ulse at the base of Q309 . The output of the Trigger Pulse Generator, at the collector of Q317, is α positivegoing fast rise p ulse wh ich is app lied to the Swee p Gate Stage. The output at the collector of Q309 is α negativegoing p ulse wh ic h is app lie d to th e brig ht-line Auto circuit. VR 304 reverts back to its low-voltage state when th e signal from the Trigger Amplifier decreases sufficien tly. VR 304 runs at the repetition rate of the input signal . Sweep Gate Stage The Swee p Gate Stage p rod uces α negative-going step to start the Sweep Generator an d α positive gate fo r use in the oscillosco pe. The positive-going pulse from the Trigger P ulse Generator enables CR319, opening an a dd itional current path for
Q377 SWEEP GATE EM ITT ER FOLL OWER
MOD E CO N TR OL
SWEEP GATE
TO
OSCI LL OSCO PE
FR OM
T R IGG ER
AMPL I F I ER
T R IGG ER PULS E
G ENER ATO R
VR 304,
Q309, Q317
IGG ERE D SWEEP RE S E TH OTLRDO FF STAG E
FR OM SWEEP' GENERATOR
0326,Q328
SWEEP GATE MULTI VI BRATOR
SWEEP START
Q360, Q368
VR358
TO
SWEEP G ENER ATOR
S273
MOD E
VR322
BR IG H T
L I NE A U TO
0331, Q338, Q339 0346, Q350
LAMP
D R I VER
T R IGG ERE D
LAMP
Q348
+5
Fig. 3-3. Simplified block diagra m of Trigge r Ge nerator circ uit . 3-4
V
Circuit Description-71370 VR 358, the swee p gate tu nnel d iode . VR 358 switch es to its h igh-voltage state ap plyi ng α p ositive signal to the base of Q360 ( p art of the b istable sweep gate multivibrator) . The collector voltage of Q360 d ec reases, pro d ucing the negativegoing step used to enable the Sweep Ge nerator . Wh en Q360 turns on, emitter-cou p led Q368 is turned off to p ro d uce t he p ositive edge of th e swee p gate out p ut . Th e sweep gate multivibrator remains in this stage, Q360 on and Q368 off, until it is reset by the swee p reset multivibrator ( p art of th e Swee p Generator) at th e en d of th e sweep. At the en d of th e swee p , the negative-going lockout gate from the swee p reset multivibrator is a p plie d to the base of Q326, turning it off . E mitter-cou p le d Q328 is turne d on ta king current from the swee p gate tunnel diode, VR 358, reverting it to its low-voltage state. This switches the sweep gate multivibrator b ac k to its quiescent state (Q360 off and Q368 on). The circuit remains in this con d ition (VR 358 in its low-voltage state) until the lockout gate returns to its h igh-level at the end of h oldoff time . Triggere d
H ol d off Stage
The Triggered H ol doff Stage re-arms the swee p gate TD, VR 358, at the end of h ol d off time . During h ol d off time VR 322 is i n its h ig h-voltage state, biasing Q326 off. At the end of h oldoff time the lockout gate from th e swee p reset multivibrator returns to its h ig h level . This switch es VR 322 to its low-voltage state, turn ing Q326 on . Q328, whic h is emitter-coupled to Q326, is turne d off to re-arm the swee p gate TD, VR 358 . At h ig h frequencies, d ou ble triggering may occur due to the finite risetime of the lockout gate as it returns to its h ig h-level . To re d uce the inci d ence of d ouble triggering of the circuit, th e trigge r pulse from Q317 is differentiated by C324- R324 an d su per-im p ose d on the lockout gate at the cathode of VR 322. Now the swee p is re-armed by one trigger p ulse an d triggered by the following trigger pulse, maintaining the p ro p er time relationship between in p ut signal and t he start of the swee p .
B right L ine Auto
The o peration of the sweep gate stage in the Ρ-Ρ AUTO and AUTO M OD E is the same as for N O RM M OD E just describe d when an a d equate trigger signal is p resent . However, when α trigger signal is not p resent, α free-runni ng trace is p roduced in the Ρ-Ρ AUTO an d A UTO M OD ES. W ith no trigger signal ap plied to the circuit, Q331, Q338 an d Q339 are off. This allows C339 to charge toward the positive 15 volt supply . As the to p of C339 becomes more
p ositive, CR 342 is turned on ma king the b ase of Q346 move positive to cutoff . E mitter-cou p led Q350 is tur n ed on an d the add itional current th roug h VR 358 switches the TD
to its h ig h-voltage state, automatically retrigge ri ng th e swee p each time the lockout gate goes to its h ig h level. The result is th at th e swee p generator circuit is automatically retriggered at the en d of each hol d off period and α freeru nning trace is p rod uced . Since the trace free-runs at the swee p rate of the sweep generator circuit (as selected by the ΤΙΜΕ /DI V switc h), α brig ht refere nce trace is p ro d uced at all swee p rates. T h e swee p TR IGG ERE D lamp will not be lit, ind icating an untriggere d condition. The swee p TRIGGERED lam p is lit each time an ad equ ate trigger signal is applied to the P ulse Generator. When the trigger signal switches VR 304 to its h igh -voltage state, Q309 is turned off. This turns on Q331, Q338 and Q339 . The to p of C339 becomes less positive, turning off CR342. Q346 is turne d on an d its collector goes positive, tu rning on Q348 . Q348 collector current lights the sweep TR IGGERE D lamp . Wh en Q346 turns on its emitter voltage decreases, and emitter-coupled Q350 is turned off to disconnect the bright li ne auto circuit from the sweep gate stage.
Wh en the TR IGGER I NG M OD E switch is in the N ORM or SI NGLE SWEEP position, th e ano d e of C R 355 is clamped to ground . T h is reverse-biases CR355 and disconnects the brig ht line auto circuit from the swee p gate stage but allows the TR IG'D light to function .
External H orizontal
Am p lifier
When the DISPLAY M OD E switch is set to AMPLIF I ER, the +15 volts is d isconnected from the base of Q370 turning off the swee p gate multivibrator current source . This d isables the Swee p Generator circuit. The Trigger Amplifier is d isabled by removing the +15 volts from the j unction of R 148-13149 . The in d icator oscillosco pe knob read ou t for the 71370 is also d isabled by app lying +15 volts thro ugh R 197 to the column current output, interface connector Α37 . The signal, external or internal as selected by the SO UR CE switc h , is a pp lied push-pull to o pe rational amplifier U 192. Α DC level a d justment ( R 186), located in the in p ut to U 192, provides α means of ad justing th e am p lifier for no h orizontal movement of the spot as th e V AR IA BLE control is rotated . U 192 converts the push-pull in p ut to α single-en d ed outp ut for use in the H orizontal P ream p. R188-C188 provid e in put freq uency com p en sation an d C189 p rovides output frequency compensation for th e amp lifier. The output of the E xternal H orizontal Amplifier is passed t h roug h t he V AR IA BLE control (11194) . This con-
trol varies the output of th e am p lifier by α factor of up to 10 . W ith the V A RIA BLE control fully cloc kwise the d eflection factor is about 25 millivolts per d ivision, an d with t he V AR IA BLE control fully countercloc kwise the d eflection factor is about 250 millivolts per division . 3- 5
Ci rcuit Description-71370
SWEEP HO LDO FF MULTI VIBR ATOR Q554, Q564 0566
HO LDO FF
AMPLIFIER
A ND CAPACITOR
Q582, C580
HO LDO FF
} TO OSCI
LLOSCO PE
RE ADY L IG H T LE SWEEP RE S E T A MPL I F I ER
SI N G
RE SET
Q454, Q456
SWEEP INHIBIT
CO MP A R ATO R 0410, 0416, Q424
D ELAY
MOD E CO N T R O L F ig .
3-4. Sweep Gen erator
TIME-BASE GENER ATOR General
The Time-Base Generator circuit (see Fig. 3-4) p roduces α sawtooth voltage whic h is changed from single-ended to 3-6
b lock d iagram .
push-pull by the H orizontal P ream p and used by the Indica f or Oscilloscope to provid e horizontal swee p deflection on the CRT. In ad d ition th is circuit pro d uces various co ntrol signals for use by the Indicator Oscillosco pe as well as inte rηαΙ signals for use in th e P lug-in .
Circuit Description-7B70
N ormal
Trigger
M ode Op eration
Disconnect Am plifier . The Disconnect Am p lifier, Q526, is q uiesce ntly con d ucting current thr ough R523 and the Timi ng R esistor, R 530. Th e negative-going ste p from the Sweep Gate M ultivibrator is app lie d to the base of the in put emitter-follower, Q524 . Q524 couples the negative step to the emitter of Disconnect Am p lifier Q526, turning it off. The timing current through Timing R esistor R530 now starts to charge Timi ng Capacitor C530, enabling the TimeBase Generator. The Disconnect Amplifier is α low-leakage transistor to im prove timing at low sweep sp eeds and h igh tem p eratures . At the end of the sweep, Q526 turns on, d ischargi ng the Timing Ca p acitor . CR 525 provides isolation b etween the Disconnect Am p lifier and t he in p ut emitter-follower d uring h ol d off time . Sawtooth Sweep Generator. The basic swee p generator circuit is α M iller Integrator Circuit.' The current flow th roug h t he Disconnect Am plifier is interrupte d by the signal from the Sweep Gate Stage. The Timing Ca pacitor, C530, now begins to charge throug h Timing R esistor R530 . The Timing Resistor an d Timi ng Ca pacitor are selected by the ΤΙΜΕ /DI V switch (α front p anel control) to p rovide swee p rates as listed on the front panel . As the Timing Capacitor begi ns to charge toward the voltage app lied to the Timi ng Resistor, the gate of Q532A, whic h is tied to the j unction of R530-C530, goes negative by the same amount . Th is d ecreases the current th rough Q532A, forcing more current throug h Q532 B. Th is increase in Q532 B drain current flowi ng throug h R 534 gives α negative-going voltage at the base of Q534 . Th is causes its collector voltage to pull up . The positive side of the Timi ng Capacitor, b ei ng tied to the collector of Q534, is also pu lled up . This action results in α positive-going voltage being applied across the Timing Capacitor, maintaining α consta nt charging current an d giving α linear rate of rise to the sawtooth output signal . The sawtooth output signal continues to rise in th is manner until the Swee p Gate M ultivi brator is switched to turn on the Disconnect Am plifier . The sawtooth output from th e collector of Q534 is connected to the H orizontal Pream p , and thr ough R 539 to the Swee p Sta rt Amplifier, Sweep Stop Comparator, and t hroug h amplifier Q546 to the Indicator Oscilloscope . CR534 protects against reverse emitter-base brea kd ow n of Q534 . CR528-CR529 p rotects agai nst gate-source breakd ow n of Q532A. Sweep Start Amplifier . Q594 sets the q uiescent voltage of the sawtooth . The collector current of Q594, flowing 1 MILLMAN & TA UB pp 540-548.
through R523, esta blishes the correct starting point of the sawtooth output signal . L 593- R596 p revent oscillations at th e faster swee p rates. They are paralleled with R592 at t h e slower sweep rates. CR 594 an d C R 592 p revent base-emitter breakdown of Q594 and Q592 . The sawtooth signal is app lied t hroug h R 539 to the base of Q592 . Th is p ositive-going signal causes Q592 to turn on h ar d er, p ulling d own its collector voltage. As the emitter of Q592 moves positive d ue to the increase in current, C R597 tu rns on to switc h t he current throug h R598 to Q592 to make α more defi nite ste p . The negative-going voltage at th e collector of Q592 is app lied t h roug h current-limiting d iode CR 581, to the base of Q582 to ch arge the h oldoff capacitor. Sweep Stop Com p arator . Th e Sweep Sto p Comparator is use d to terminate the sawtooth sweep when th e swee p has reache d α pre-determine d level . The circu it components are chosen to set the reference level for sweep te rmi nation at ap p roximately 10 .5 volts at the base of Q408 . The positive-goi ng sawtooth app lied to the base of Q408 increases the current through 13408-13409 . The base of 0406, whic h is tie d to the j unctio n of R 408- R409, rises an amount corres p on d ing to the sawtooth am plitude at the base of Q408 . Th is action continues until the emitter of Q406 becomes p ositive enough to forward bias CR406. When CR406 tu rns on, the positive rise at the base of Q436 switch es th e reset multivibrator. The voltage at the collector of Q436 goes n egative a n d t his n egative-going step app lie d to the swee p gate circuit end s the swee p.
H ol d off Ca pacitor and Am p lifier . Q582, wh ic h is turned on during sweep time, charges th e h oldoff capacitor . Wh en the swee p end s, Q582 turns off. Now th e h oldoff capacitor starts to discharge toward -50 volts through R 582 and at some sweep rates, thro ugh R 580. When the top of C580 disc harges negative enough to forward-bias CR574 and CR575, the h ol doff capacitor voltage is a p plied to the base of Q554 . This d rives Q554 to cutoff, switching the h old off multivibrator to en d h ol d off time . V oltage limiting diodes CR580 an d C R 582 protect the b ase-emitter j unctio n of Q582 . C R581 limits the "on" base current of Q582 . VR 576 an d C R576 limit th e n egative voltage on h ol d off capacitor C580 .
The HF STAB control, R 146B , through R 583, varies the discharge rate of the h oldoff ca pacitor to provide α stable d isplay at fast sweep rates. This change in h oldoff allows swee p sync hronization for less d isp l ay j itter at the faster sweep rates. The HF STAB circuit h as little effect at slow sweep rates. 3-7
Circuit Description-71370 Sweep H oldoff . M ultivibrator . Q554-Q564 a re connected i n α bi-stable Sc hmitt Trigger co nfiguration . Quiescently Q554 is off and Q564 is on . Α positive pulse from th e sweep reset multivibrator switches the hol doff multivibrator to its second stable state, Q554 on an d Q564 off.
T he swee p hol doff multivibrator is returned to its first
stable state when the hol doff capacitor has charged negative enough to d rive Q554 to cutoff . The fast switch ing action of the sweep holdoff multivibrator pro duces shar p leading an d trailing edges for the sweep holdoff gate. The output of t he mu ltivibrator, coupled throug h emitter-follower Q566, goes to the indicator oscillosco pe and to the holdoff d isconnect d io de. During sweep time the voltage on the holdoff ca pacitor reverse- biases C R575 and the current in R 573 switches to CR572, turning off Q468 . VR 573 d etermines the time when the current switch ta kes place . Du ring holdoff time th e hol doff d isconnect diode, CR571, co ntrols the current available to th e reset control am plifier, Q468 . The p ositivegoing edge of the hol doff gate turns on CR571 . Th is moves the emitter of Q468 positive, turn ing it off. At the end of hol doff time the negative-going edge of the hol d off gate opens C R 571, mak ing th e current through R468 availa ble to the reset control amplifier. Reset Control Am p lifier . Q468 p rovides current to th e base of Q436 to switch th e sweep reset multivibrator to its reset state. The current th rough R 468 into the emitter of Q468 is co ntrolled by C R571 an d C R 572 as stated above, or b y CR468 as ex p lained u nder single-sweep operation.
Sweep Reset Mu ltivibrator . The sweep reset multivibrator, Q432-Q436, resets the swee p gate TD at the en d of hol doff time . In the reset state, Q432 is off and Q436 is co nducting . Th e to p of R438 is pulled up to its hig h level . T he sweep is terminated by current from Q406 moving the base of Q436 p ositive to cutoff . This switches the multivibrator to its ot her stable state, 0432 on an d Q436 off. The voltage at the to p of R438 drops negative to its low level. This negative step is ap plied to the sweep gate stage to latch the sweep gate TD in its low-voltage state. At the en d of holdoff time, Q468 is turned on, driving the base of Q436 less positive . This turns Q436 on an d the multivib rator switches bac k to its reset state. The voltage at the top of R438 is pulled up to its h ig h level . This positivegoing step is applied to the Sweep Gate Stage to unlatch t he Sweep Gate TD, an d the sweep circuits are ready for the next sweep to start. Single Swee p Operation General. Operation of the Swee p Generator Circuit in th e SI N G LE SWEEP p osition of the TR IGGER I NG M OD E 3- 8
switch is similar to operation in the ot her modes. H owever, after one swee p h as been prod uced , the Swee p Reset Multivi brator Stage d oes not reset. All succeeding trigger pulses are locked out until the RE SET b utton is pressed . In the SI NG LE SWEEP position of the M OD E switch , removed from the top of R 464 . C R 466 is opened an d CR 468 becomes forward-biase d, opening α cu rrent path th rough R 468-C R 468- R466. Now, at the end of holdoff, th ere is no curre n t th rough Q468 to pull down the base of Q436 an d th e Swee p Reset Mu ltivibrator does not reset . The circuit remai ns in this conditio n until reset by th e Single Sweep Reset Amplifier Stage.
the -15 volts is
Single Sweep Reset Am plifier . The Single Swee p Reset Amplifier pro duces α negative pulse to reset the Sweep Reset Multivibrator stage so another swee p can be produced in the SI N G LE SWEEP mode of operation . Quiescently, Q454 is conducting h ard and Q456 is held cut off. Wh en th e RE S E T button is pressed , C R451 is turned on . Th is clam ps th e j unctio n of CR451-C R453 at +0 .6 volt . C R453 an d CR454 open an d t he base of Q454 d ro ps to zero volts, tu rn ing it off. Th is turns Q456 on hard, pulling d own its collector voltage . This negative-going step ap plied to C457-C R459 p rod uces α negative pulse at the base of Q436 whic h is sufficie nt to reset th e swee p reset multivibrator. This enables the swee p gate TD, and th e next trigger p ulse will produce another swee p on the d is play. C456 p rovid es positive feedback with α lo ng time-constant to k eep Q454 off long enough to p revent switchi ng transients from producing multi p le swee ps. L am p Driver . In the SI NG LE SWEEP MOD E , the base of Q446 is connected throug h CR446, CR 448 an d CR449 to the collector of Q436 . When Q436 is cut off, d uri ng hol doff time and until the RE SET button is pressed, th e base of Q446 is b iased to cutoff . When the RESET button is pressed, Q436 is turned on and its collector voltage rises. This positive-going voltage ap plied to the base of Q446 turns it on (C446 co ntrols turn-on time) . Q446 collector voltage drops an d the RE ADY lamp turns on . Th e RE ADY lamp remains on until the end of th e sweep when Q436 is again turned off.
Alternate Operation
In alternate operation th e ind icator oscilloscope p rovi des α sweep in hibit current to th e emitter of Q410 . Q410 p rovides α low im pedan ce inp ut and α voltage dr ive for the in hibit comparator, Q416 a n d Q424 . Α swee p in h ibit current in put of 1 mA or greater turns on Q410 . Th is raises the base voltage of Q416, turning it on and tu rn ing Q424 off. The collecto r cu rre nt of Q416 p ulls the base of Q432 in α negative d irection turning Q432 on an d Q436 off to latch the swee p gate TD as d escribed previo u sly.
Circ uit Description-71370 Delaye d Swee p
Operation
In th is mod e of o p eratio n the time-base in the left h orizontal (Α) compartment p rovi des the swee p inh ibit current to the emitter of Q410 . The swee p in h ibit circuit operates as described und er Alternate Operation. The Α time-base also p rovi d es α d elay mode control voltage to the anodes of CR462 in the sweep generator and CR334 in the trigger generator . The delay mode control voltage causes C R 462 to con-
d uct, CR463 to turn off, C R 464 to cond uct and C R466 to turn off. This puts the Β sweep in single swee p mode as described un d er Single Swee p Operation,
During sweep in hibit time Q424 is turne d off. This turns off CR428, an d with C R463 off the current from R428 turns on CR 469. C469 now charges to about +1 .5 volts, turning on Q468 . This d oes n ot reset the swee p which is locked out by the conduction of 0416 . Wh en swee p in hibit ends Q416 turns off, ma king the base of Q432 more p ositive. Q424 turns on to open C R469. C469 h ol d s its charge long enough to allow Q468 to reset the sweep at the end of in h ibit time . This action allows only one sweep after each time the sweep is inh ibited . The delay mode control voltage is also connecte d to the sweep gate TD, VR 358, throug h C R357 an d R 356. W it h the Α time-base Β D EL AY M OD E in Β TR IGGER ABLE A F TER D EL AY, th e control voltage is about +3 volts, which does not cause CR357 to conduct. T hus, th e swee p will wait for t h e first trigge r after th e d elay interval to run . W it h th e Α time-base Β D ELAY M OD E in Β STA RTS A FT ER D EL AY the co ntrol voltage is about +4 .5 volts. Th is is sufficient to cause CR357 to conduct and increase th e curre nt through R356 to the swee p gate TD, VR 358. Now the TD will change to its h igh -level state and start the sweep as soon as it is enabled by the sweep reset multivibrator at the en d of in h ibit current to Q410 .
Wh en the I NDEPEN DEN T mode is selected by the Α
P lug-in DEL AY M OD E switch, the sweep inh ibit is h el d at about the 0 mA level . The d elay mod e control voltage is clam ped to grou nd . The Α time-base h as no control over
the Β time-base and each operates as an in d ependent TimeBase .
H orizontal P reamp Input Amp lifier . Th e Input Amplifier, Q764, is an operatio nal (feed bac k) amplifier wh ic h provides stable gain and
low input impedance. POSITIO N co ntrol, R 744 Α&Β, varies the DC level at the base of paraph ase amplifier, Q784, to position the d isplay h orizontally. R 771- R 722 Q774 su pply α stable DC reference level to th e base of Q794 . Sweep Cal ad justment R 740 a d justs the sawtooth input cu rrent . Th is controls the rate of rise of the sawtooth output of th e P arap h ase Am p lifier .
P arap hase Amplifier . The P arap hase Amplifier, Q784Q704, takes the single-end ed input and converts it to α push-pull output for use in the In d icator Oscilloscope. The negative-going sawtooth applied to the base of Q784 increases cond uction in this h alf of the Paraph ase am p lifier . Throug h emitter-follower action the negative-going sawtooth signal is also app lied to the emitter of Q794, decreasing con d uction th rough th is h alf of the P araphase Amplifier . The results of these actions are α positive-going sawtooth at the collector of Q784 an d α n egative-going sawtooth at th e collector of Q794 .
M agnifier . R elay Κ780, when energized parallels R782 with R786- R785 to i ncrease the gain of the amplifier by α factor of 10 . R 785 is ad justa ble for calibration of th e Χ10 gain . M ag R egis a d justment R 795 is used to balance the outp ut for no trace sh ift when switching from Χ 1 to Χ10 magnification. R ead out B lock The R ead out Bloc k consists of switching resistors and α set of contacts o p erated b y the Χ 10 M AG relay. The switc hing resistors, selected b y the setting of the Readout Switch ( p art of the ΤΙΜΕ /DI V switch), are use d to signal the In d icator Oscilloscope of the setting of the ΤΙΜΕ /DI V switch .
R efer to Schematic Diagram 7, Timing Switch , at the rear of the manual to fin d the resistors associated with α particular setting of the ΤΙΜΕ /DI V switch . The number 1, 2 or 5 is selected by resistors R704-R705- R706. The number of zeros is selected by resistors R 711- R712- R713- R715 . The TIME su b-unit (milli, micro, or ηαηο ) is selecte d by resistors R721-R722- R723- R724. R728-13729 select the symbol S (seconds) . R 701-13702 select the symbol (greater than) when th e V A R ΤΙΜΕ /DIV knob is in the out (uncal) position . R 715 is switched out by the Χ10 M AG to increase the dis p layed read out by α factor of 10 .
71370
SECTION 4 MAINTENANCE Change information, if any, affecting th is section will be fou n d at the rear of th e manual. I nterior. Dust in th e interior of the instrument shoul d
Intro d uction Th is section of the manual contains maintenance information for use in p reve ntive mainte n ance, corrective maintenance an d troubleshooti ng of th e 71370. PREVEN TI VE MAI NTEN AN C E
be removed occasionally due to its electrical cond uctivity un d er h ig h-humidity conditions. Th e best way to clea n th e inte rior is to blow off the accumulated d ust with dry, lowvelocity air. R emove any d irt whic h remains with α soft paint brus h or α cloth d ampened with α mil d detergent and water solution . Α cotton-ti p ped a p p licator is useful for cleaning in narrow spaces .
General
P reventive maintenance consists of cleaning, visual inspection, lubrication, etc. Preventive maintena nce performed on α regular basis may p revent instrument b reakdown and will improve the reliability of this instrument. Th e severity of the environment to whic h t he 71370 is subjected determin es the frequency of maintenance. Α co nvenient time to p erform preventive maintenance is preced ing recalibration of the instrume nt. Cleaning The 71370 shoul d be cleaned as often as operating con d itions require . Accumulation of dirt in the instrument can cause overheating and component brea kdown . Dirt on components acts as an insulating blank et and prevents efficient heat dissi p ation. It may also provi d e an electrical cond uction path . The covers of the indicator oscillosco p e minimize the amoun t of d ust wh ich reac hes the interior of the 71370. Operation of the system with out the indicator oscilloscope covers in p lace necessitates more freq ue nt cleaning . Wh en th e 71370 is n ot in use, it should be stored in α protected location suc h as α dust-tig ht cabinet. CAUTION Avoid the use of ch emical cleaning agents wh ich migh t damage the plastics used in th is instrumen t. Avoid chemicals wh ich contain benzene, toluene, xylene, acetone or simila r so/vents.
E xterior. L oose dust accumulated on the outside of the 7Β70 can be removed with α soft cloth or small p aint brush . The paint brus h is p articularly useful for dislodging dirt on an d aroun d the front-panel controls . Dirt wh ic h remains can be remove d with α soft clot h dam pened in α mild detergent and water solution . Abrasive cleane rs shoul d not be use d . Ο
V isual
Ins p ection
Th e 71370 shou l d be insp ected occasionally for such
d efects as broken connections, broken or damaged circuit boards, im pro perly seated transistors or relay, and h eatd amaged parts.
The corrective p roced ure for most visible d efects is obvious; h owever, p articu lar care must be ta ken if h eatdamaged components are found. Overheating usually in d icates other trouble in the instrument ; therefore, it is im p ortant that the cause of overheating be corrected to prevent α recurrence of the d amage.
Transistor Checks
Perio d ic chec ks of the transistors in t he 71370 are not recommen d ed . The best check of transistor p erfo r mance is actu al operation in t he inst rument. M ore d etails on checking transistor operation are give n under Troubles hooting .
Recalibration To ensure accu rate measurements, chec k the cali bration of th is i nstrument after each 1000 h ours of operation or every six months if used infrequently . In add ition, replaceme nt of com ponents may necessitate recalibration of the affected circuits . Complete calibration instructio ns are given in Section 5. The Performance Chec k/Calibration Procedure can also b e h el pful in localizi ng certain troub les in the instrume nt. In some cases, minor troubles may be revealed and /or corrected b y calibration .
Maintenance-71370 TRO UBLE SHOOTI NG Introduction
T he following in formation is provi d ed to facilitate troubleshooting of th e 71370. Information contai ne d in other sections of th is manual shoul d be used along with the following in formation to aid in locating th e d efective component . An understan d ing of the circuit o p eration is very helpful in locati ng troubles . See the Circuit Descri ption section for com p lete information . Troubles h ooting Aids
Diag rams. Circuit diagrams are given on fold out pages in Section 7. The com ponent number and electrical val ue of each component in th is instrument are s hown on the d iagrams. Important voltages an d waveforms are also shown on the d iagrams. Switch Cam I d entification . Switch cam num bers shown on t he-diagrams in d icate the p osition of the cam in the com p lete switch assembly . The cams are numbered from the front, or mounting en d of the switch, towar d the rear .
Resistor Color-Code . In ad d ition to the b rown composition resistors, some metal-film resistors and some wirewound resistors are used in the 71370. T he resistance values of wire-wound resistors are p ri nted on the bod y of th e com ponent. The resistance values of compositio n resisto rs and metal-film resistors are color-code d on the com ponents (some metal-film resistors may h ave th e value p ri nted on th e bod y) with ΕΙΑ color code . The color code is read starti ng with t he stri pe n earest the en d of the resistor . Composition resistors h ave fou r stri pes whic h consist of two significant figures, α m ulti p lier and α tolerance value (see Fig. 4-1) . Metal-film resistors h ave five stri pes consisting of three significant figures, α multiplier and α tolerance value. Ca pacitor Marking . T h e capacitance values of common d isc capacitors and small electrolytics are marke d in microfarads on the side of th e com p onent body . The white ceramic ca p acitors used in the 71370 are color cod ed in picofara ds using α mo d ifie d ΕΙΑ co d e (see Fig. 4-1) . Dio d e Color Cod e. T he cathode end of each glassencased diode is indicated by α stri pe, α series of stri pes or α d ot . For most silicon or germanium diod es with α series of a n d Capacitor Color Code Tole rance Mu ltiplier SignifiCa p aciesisCCa p aci-~ R esiscant R to rs tors tοrs F ig ures tors --10-2 ±10% ___ ___ Ι ___ Ι ±5% Ι 10 -1 ±20% --or 1 0 Ι 1 2 pF* Resistor
Colo r Silver Gold B lack
Composition Resistors:
-1 st, 2nd and 3 rd significant figures;
0 -multi p lier; ΤΟ -tolerance; TC
1
R ed
Ι Orange Ι Yellow
2 3 4
102 Ι 103 Ι 104
102 Ι 103 104
Green
Ι
5
10 5
10 5
B l ue
V iolet
Ι (
6 7 8
Ι 10 6 Ι ___ ---
106 ___ 10-2
___ ___ ---
Whίte
Ι
9
---
10-1
---
Gray
Ceramic Capacitors:
and
Brow n
-tem peratur e coefficie nt.
10
(none) *For capacitance of 10 pF or less .
±1 %
±2% Ι ±3% ±4%
_
±0.5%
±20ο/ο
Ι Ι
Π 1 °ροF*
r
±2% ±3 °/ο +100%
-0
±5% or 0.5 p F* ___ --+80% -20% or 0.25 pF* - ρ°F* or ±10% or 1 pF*
NOTE : Ο a nd /o r Ο colo r co de fo r ca p acitors depe nds upon and ca p acitor ty pe. May not be present 1η so me cases.
man ufacturer
F ig . 4-1 . Color-co de for resistors a nd ceramic ca pacitors.
4-2
10
Maintenance-71370 stripes, the color cod e also ind icates the type of diode or identifies the Tektronix P art N umber using the resistor color co d e system (e .g ., α d iod e color-co d ed blue- or p inkbrown-gray-green indicates Tektronix P art N umber 1520185-00) . The cathod e and anod e en d s of metal-encased diodes can be identifie d by the d io d e symbol marke d on the body. Troubleshooting Equi pment The following equipment is useful for troubleshooting the 71370: 1 . Transistor Tester Descri p tion : Tektronix Ty p e 576 Transistor-Curve Tracer or equivalent .
P ur p ose: To test the simicond uctors used in this instrument . 2 . V olt-ohmmeter Descri p tion : 20,000 ohms/volt . 0-500 volts DC . Accurate within 3% . Test p robes must be well insulated .
Purpose : To measure voltages and resistances . 3. Test Oscilloscope Descri p tion : DC to 200 M Hz fre q uency resp onse, 5 millivolts to 5 volts/d ivision deflection factor . Use α 10Χ probe.
P ur p ose: To check waveforms in the instrument . 4. Plug-In E xten d er Description : Rigid plug-in extender, Tektronix Part number 067-0589-00 . Purpose: P ermits o p eration of the unit outsi d e the plug-in compartment for better accessibility during troubleshooting .
Troubleshooting Techni q ues This troubleshooting proced ure is arranged in an order which checks the simple trouble p ossibilities before p rocee d ing with extensive troubleshooting. The first few checks ensure p roper connection, o p eration an d calibration . If the trouble is not located by these checks, the remaining steps aid in locating the defective component. When the d efective component is locate d , it should be replaced following the rep lacement proced ures given under Corrective M aintenance .
1 . Check Control Settings . Incorrect control settings can in d icate α trouble that d oes not exist. If there is any question about the correct function or o peration of any control, see the Operating Instructions section. 2 . Check Associated Eq ui p ment . B efore proceeding with troubleshooting of the 71370, check that the eq uipment used with this instrument is operating correctly. Check t hat the signal is p roperly connected an d that the probe cable is not d efective . The indicator oscilloscope and vertical pl ug-in unit can be checked for p roper operation b y substituting another time-base unit which is known to be operating properly (perferably another 71370 or similar unit) . If the trouble p ersists after substitution, the indicator oscilloscope and/or vertical plug-in unit is defective. 3. Check Instrument Calibration . Check t he calibration of this instrument, or the affected circuit if the trouble exists in one circuit. The a p parent trouble may only be α result of misa d justment an d may be corrected by calibration . Complete calibration instructions are given in the Calibration section. 4. V isual Check. V isually check the portion of the instrument in which t he trouble is located . Many troubles can be located by visual indications such as unsoldered connections, broken wires, d amaged com ponents, etc. 5. Isolate Trouble to α Circuit. To isolate α trouble to α circuit, note the trouble sym ptom . The symptom often in d icates the circuit in which the trouble is located . F or exam p le, if normal triggering can be obtained in the ΙΝΤ mode but cannot be obtained in the ΕΧΤ mode, the external trigger am p lifier or the SOURCE switch is probably at fault. When trouble sym p toms app ear, u se the front-panel controls and the CRT display to try to isolate the trouble to one circuit . When the trouble app ears in more than one circuit, check all affected circuits by taking voltage and waveform readings .
F ig . 4-2 p rovi d es α gui d e to ai d in locating α defective circuit . This chart does not inclu d e checks for all possible d efects ; use steps 6 and 7 for further troubleshooting. Start from the top of the chart and perform the given checks on the left side of the p age until α step is found which is n ot correct. F urther checks and /or the circuit in which t he trouble is probably located are listed to the right of this ste p . After the d efective circuit h as b een located, p roceed with steps 6 an d 7 to locate the d efective component(s) . 6. Check Voltages and Waveforms . Often the d efective com p onents can be located by checking for the correct 4-3
4-4
Maintenance-71370 voltage or waveform in the circuit. Typical voltages an d waveforms are give n on the diagrams. CAUTION Do not clamp probe to pin connectors as this may break or damage the connectors. ΝΟΤΕ
Voltages and waveforms given on the diagrams are
not absolute and may vary slightly between instruments. To obtain operating conditions similar to those used to take these readings, see the first diagram page.
7. Check Ind ivi d ual Components . The following procedures describe methods of chec king i ndividual components in th e 7Β70 . Components whic h are soldere d i n place are best ch ec ked by d isconnecting one en d . This isolates the measurement from t he effects of surrounding circuitry. Α. RELAYS. The 71370 uses two types of relays . The eight p in DPDT relay is symmetrical and may be re p laced in its socket facing either direction . The five p in S PDT relay will mate with its socket in one d irectio n only . These relays, wh ich are plugged into the circuit board, may be remove d and c hec ked . U sing an ohmmeter, chec k for α DC resistance of 600 oh ms across the coil . E ac h relay can b e actuated by a p plying 15 volts across the coil . W ith th e relay actuate d , chec k the normally open co ntacts for continuity . When return ing the relays to the circuit board , place th e five pin relay in the five pin socket an d the eight pi n relays in the eight pi n sockets. Β. TRANSISTORS. The best chec k of transistor operation is actual performance und er operating con d itions . If α transistor is sus p ected of being d efective, it can best be chec ked b y substituting α new component or one which has b een chec ked p reviously . H owever, b e sure that circuit conditions are not such t hat α replacement transistor might also be d amaged . If substitute transistors are not available, use α dynamic tester (suc h as Tektronix Ty pe 576) . C. DIOD ES. Α diode can b e chec ked for an open or shorted co n d itio n by meas uring the resistance between terminals . W ith an ohmmeter scale h aving an internal source of betwee n 800 millivolts an d 3 volts, the resistance should be very h igh in one direction an d very low when the leads are reversed . CAUTION Do not use an oh mmeter scale that has α high internal current. High currents may damage the diode.
D . RE SISTO RS. R esistors can b e chec ked with an ohmmeter . Chec k the E lectrical P arts L ist for the tolerance of th e resistors used in t his instrument . Ε . I N D U CTO R S . C h ec k for open in d uctors by chec king continuity with an o hmmeter . Shorted or p artially sh orted inductors can usually be found b y chec king the waveform res p onse when h ig h-fre quency signals are p assed th rough t h e circ uit . P artial shorting often redu ces h ig hfre q uency r es p onse .
F . CAPACITORS. Α leaky or shorte d ca p acitor can b est be detected by ch ec king th e resistance with an oh mmeter on the h ighest scale. Do not exceed t he voltage rating of the ca p acitor . The resistance reading should be h igh after initial ch arge of the ca pacitor . An o pen ca p acitor can best be d etected with α ca p acitance meter or by chec king whether the ca pacitor p asses AC signals.
8. R epair and R eadjust the Ci rcuit . If any d efective p arts are locate d , follow the replacement p roced ures give n in this sectio n. Be sure to chec k the performance of any circuit that h as b een repaired or that h as h ad any electrical components replaced .
CO RRECTIVE MAI NTEN ANCE General Corrective maintenance consists of component replacement and instrument repai r. Special techn iques requ ired to re p lace com ponents in th is instrument are given h ere. Obtaining
R e p lacement P arts
Stand ard P arts . All electrical an d mechanical part r ep laceme nts for the 71370 can be obtaine d t hroug h your local Tektronix F iel d Office or re p resentative . H owever, ma ny of the stan dard electronic components ca n be obtained locally in less time t h an is requ ired to order them from Tektronix, Inc . Before purc hasing or or d ering re placement p arts, chec k t he p arts list for value, tolerance, rating an d d escription . ΝΟΤΕ When selecting replacement parts, it is important to remember that the p h ysical size and shape of α component may affect the performance in the instrument, particularly at h igh frequencies . All replacement parts should be direct replacements unless it is known that α different component will no t adversely affect instrument performance .
Special Parts . In addition to the standard electronic components, some special p arts are used in the 7 Β70 . These 4-5
Maintenance-71370
parts are manufactured or selected by Tektronix, Inc . to meet specific performance re q uirements, or are manufactured for Tektronix, Inc. i n accord ance with our specifications. These special parts are indicated in the parts list by an asterisk preceding the part number . M ost of the mechanical parts used in this instrument have been manufactured by Tektronix, Inc. Order all special p arts d irectly from your local Tektronix F ield Office or representative . Ordering Parts . When ordering replacement parts from Tektronix, Inc., inclu d e the following information : 1 . Instrument Ty p e. 2. Instrument Serial
N umber.
3 . Α d escription of the part (if electrical, inclu d e circuit number) . 4 . Tektronix P art N umber.
may effect the calibration of this instrument . When transistors are replaced, check the operation of that part of the instrument which may be affected . R e placement transistors should be of the original ty p e or α d irect replacement . Remount the transistors in the same manner as the original . F ig . 4-3 shows the lea d configurations of the transistors use d in this instrument . This view is as seen from the b ottom of the transistor . When replacing transistors, check the manufacturer's basing d iagram for correct b asing. I nterconnecting P ins and P in Socket Replacement . Two types of mating connectors are used for these interconnecting p ins. If the mating connector is mounte d on a plug-on circuit boar d , α special socket is sold ere d into the b oard . If the mating connector is on the end of α lead, α p in connector is used to mate with t he interconnecting pin. The following information provi d es the replacement procedure for the various ty p es of p ins and pin sockets.
Sol d ering Techni q ues WA RN IN G Disconnect th e instrument from th e power source before soldering.
Circuit Boar d s. The components mounte d on the circuit board s in the amplifier can be replaced using normal circuit board soldering techni q ues . Keep the following p oints in mind when soldering on the circuit boards . 1 . U se α p encil-ty p e sol d ering iron with α power rating from 15 to 50 watts. 2 . Apply h eat from the sol d ering iron to the j unction between the component and the circuit board . 3. H eat-shunt the lead of the component by means of α p air of long-nosed p liers.
CAUTION
Th e relays used in th is instrument can be damaged by
h eat. Do not apply α soldering iron to th e relay sock et until the relay has been removed from th e sock et.
Transistor R e p lacement. Transistors should not be replaced unless actually d efective . If removed from their sockets d uring routine maintenance, return them to their original sockets. U nnecessary re p lacement of transistors 4- 6
CAUTION When removing the stub of α b roken pin connecto r, it is importan t not to disturb the old ferrule wh ich is swaged into the circuit board. Use the minimum amount of h eat n ecessary to remove the pin. The new pins are supplied with ferrules intact. Remove the ferrule from the new pin before inser ting th e pin into th e old ferrule in th e circuit board. Th e old ferrule may be reamed out with α .031 drill if necessary. Α circ u it board pin replacement kit including necessa ry tools, instru ctions and replacement p ins is available from Tek tronix, Inc. Order Tek tronix Part No. 040-0542-00.
Α. CIRCUIT B OARD P INS. To re p lace α p in which is mounted on α circuit b oard , first d isconnect any p in connectors . U nsol d er the damaged pin an d pull it out of the circuit board. P ress the new pin i nto the ferrule in the circuit board . (Notice that the ferrule is n ot centered on the p in ; be sure the replacement pin is positioned in the same manner as the original .) Sol d er the p in on both sides of the circuit board . If the pin was b ent at an angle to mate with α connector, bend the new p in to match the associated pins. The insi de ra d ius of this bend shoul d not be less than 0.025 inch . 4. Avoi d excessive h eating of the j unction with the circuit b oard , as this could se p arate the circuit board wiring from the laminate . 5.
U se electronic grad e 60-40 tin-lead solder .
6. Clip off any excess lead length exten d ing b eyond t he circuit b oar d an d clean off any resi d ual flux with α flux-
Maintenance-71370 removing solvent. Be careful that the solvent does not remove any printing from the circuit b oard .
TRANSISTO R S
Metal Te rminals . When soldering metal terminals (e .g ., switch terminals, p otentiometers, etc.), use 60-40 tiri-lead sol d er and α 15 to 50 watt sol d ering iron. Observe the following p recautions when soldering metal terminals: Collector
Em itter
Collecto r
E mitter
Base
Base
1 . Apply only enough heat to ma ke the sol d er flow freely . 2. Apply only enough solder to form α soli d connection . Excess solder may im pair the function of the p art. 3. If α wire exte nd s beyo nd t he solder j oi nt, clip off the excess .
Collector
Base
Em itter
Collecto r, Base
E mitter
4. Clean the flux from the sol d er j oint with α flux-removing solve nt . Comp onent R eplacement WA RN I N G
Disconnect th e equip men t from th e power source befo re replacing components.
Relay Replaceme nt. T he relays in the 71370 are ma nufactured by Te k tronix Inc. If α relay fails, α rep lacement may be ord ered from your local Tektronix Fiel d Office or rep resentative . The five p in relay sockets on the circuit board will accept only the five p in SPDT relay . It is possible, h owever, to p lace α five pin S PDT relay in an eight p in socket inte nd ed for use with one of the eight p in relays . This would not d amage the instrument or the relay, but would cause α malfunctio n of the instrument . The eight p in DPDT relays may b e p laced in their soc kets faci ng either d irection, as these relays are symmetrical .
F . E .T : s
Gate Drai n
Sour ce
So urce Drai n
Gate
I NTEG RAT ED CI RCUITS
Β . CI RCU IT BOAR D PIN SOCKE TS . The p in sockets on the circuit b oard s are sol d ered to the rear of the boar d . To rep lace the sockets, first unsol d er the socket (use α vacu um-type desol dering tool to remove excess sold e r). Straig hten the tabs on the socket to remove it from the h ole in the circuit board . P lace the new socket in the circuit board h ole and p ress the tabs d own against the b oar d . Sol d er the socket tabs to the circuit board . ΝΟΤΕ
Th e spring tension of th e terminal sockets ensures α good connection between th e circuit board and the pin. This spring tension can be destroyed by using the p in sockets as α co nnecting p oint for spring-loaded probe tips, alligator clips, etc. F ig . 4-3. E lectr od e co nfiguration of tran sistors a n d in tegrated circuits use d in t his instrum ent.
C . EN D- LE AD PIN CO NNECTO RS. The . pi n connectors used to co nn ect the wires to the circuit board p ins are 4-7
Maintenance-71370 clamped to the en ds of the associated leads. To replace α d amage d pi n connector, first remove th e old p in co nnector from the en d of the lea d . Clam p the new pin connector to the end of th e lead . Some of the pin connectors are grouped together an d mo unted in α p lastic h older . These connectors are removed and re-i nstalled as α unit . To p rovide correct orientation of this multi-co n nector when it is replaced , an arrow is stamped on the circuit boar d and α match ing arrow is moulded into the p lastic h ousi ng of the multi-pin connector. Switch Replacement . Two types of switches are use d in the 7Β70 . The pushbutton switches and the cam-type switch sh ould be replaced as α unit if damaged . The following special maintenance information is provided for th e cam-type an d p us h button ty pe switches . CAUTION Repair of th e cam switch sho u ld only be undertaken by sk ille d maintenance personnel. Switch alignment and contact spacing must be carefully maintained for proper operation of the switch. Α cam-type switch repair k it including the necessary tools, instructions and replacement contacts is available from Tek tro n ix, Inc. Order Tek tro nix Part No. 040-0541-00.
Α. CAM-TYPE SWITCH . The cam-ty pe switch (TIME/ DI V ) consists of α r otating cam, whic h is turne d by the front panel k nob, and α set of contacts m ounted on an ad jacent circuit board. These switc h contacts are actuate d b y lobes on the cam . The ΤΙΜΕ /DIV switc h can be disassembled for inspection, clea ning, repair or replacement as follows:
1 . Remove the four sc rews wh ich hol d the metal cover over the switch . T h e switch is now open for insp ection or cleaning . 2. To completely remove the switch, loosen the set rew on the collar securing the V A R IA BLE shaft to the sc V AR IA BLE potentiometer an d pull the shaft completely out th e front of the unit . L oosen th e two set screws on the ΤΙΜΕ /DIV kno b and remove the k nob. Remove the plastic bush ing from the access hole for the ΤΙΜΕ /DIV shaft.
3. Remove the sweep generator boar d by looseni ng the securi ng screws and carefully lifting out .
4. Remove the six screws which hold the cam switch to the interface circuit board an d remove the cam switch. 5. To remove the cam from the front support b lock, remove the retaining ring from the shaft on the front of the switch and slide the cam out of t h e su pport b lock . Do not lose the small detent roller . 6. To replace defective switch contacts, unsolder the damaged contact and clean the sol d er from the h ole i n the circuit board . F ollowing the procedure given in the instruction sheet inclu d ed with t he cam switc h re p laceme nt k it, 4-8
use the alig nment tool to p osition the new contact in p lace . Solder the contact using the sol d ering techn i q ues given previously in th is sectio n of the manual . 7. To re-assemble the switch, reverse the above pro-
ced ure.
Β. PUSH-BU TTON SW ITC HE S. U se the following p roced ure to re p lace the five p ushb utton switches : 1 . L oosen the set screws and remove the P OSITIO N , LEVEL/S LOPE, ΤΙΜΕ /DIV , VAR IA BLE, and Am p lifier V AR IA BLE kn obs. 2. Remove the front p anel to gain access to the switch mounting screws . 3 . To remove the DISPLAY M OD E switch, remove the philli ps h ead screw and d isconnect the multi-pi n connector . 4. To remove the M AG N I F I ER switch , remove the phillips head screw and d isconnect the multi- pin connector. 5 . To remove the TR IGGER ING switch es, remove the two ph illi p s h ead screws from each of the M OD E , CO UPL ING and SO UR CE switches . Disconnect the following multi-pin connectors : AMPLI F IER VAR IA BLE, DISPL AY M OD E , SWP CA L, P OSITIO N , LEVEL/S LOPE, TR IG'D and M AG N IF I ER . Disco nnect the two p in connectors from the SO UR CE and CO UPL I NG switches . Remove the fou r screws securing the fro n t of the unit to the top and b ottom an d remove the front of th e unit . Remove the TR IGGER I NG switches (the swee p ge nerator board may h ave to be removed to ta ke out the T RIGG ER I NG M OD E switch) .
Light Bul b Replacement . To replace the light b ul bs follow the above procedure to remove the switches . Remove the screw an d cover from the back of the switch to expose the light bu lb . Unsolder the two leads an d remove the light b ulb. Cut th e leads of the replacement light b ulb to the same lengt h as those of the ol d bu lb . P lace insulating sleeves over the lead s and replace the new bulb i n th e exact position of the ol d bulb . R eassem ble by reversing the above procedure .
Instrument
R e packaging
If th e 7Β70 is to be shipped for long d istances by commercial means of transportation, it is recommen de d th at the instru ment is repac kaged i n t he original manner for maxim um protection . The original shi pping carton can be saved an d used for this p urp ose or new s h ip p ing cartons can be obtai n ed from Tektronix, Inc . th roug h your local Te ktronix F iel d Office or representative . R epac kaging information can be found in t he M ec h anical P arts Illustrations at th e r ear of this manual . ΝΟΤΕ
The plug-ins sh o u ld not b e sh ipped installed in an oscilloscope. The oscilloscope pac k aging material is not designed to protect th e plug-ins.
Fig. 4-4. Trigger board showing location of components .
4- 9
Fig. 4-5. Time Base board showing location of components .
4- 1 0
Fig. 4-6. Interface board showing location of components .
4- 1 1
4-12
4-13
7 Β70
S ECTIO N 5
PERFORMA N CE C HE C K /CA L IBRATIO N Change information, if any, affecting th is sectio n will be found at th e rear of the manual.
Introduction To assure instrument accuracy, chec k t he calibration of the 71370 every 1000 h ours or every six mo nths if used infreq uently . B efore cali bration, thoroughly clean and ins p ect th is instrument as outline d in the M aintenance Section . The com p lete P erformance Chec k/Calibration P roced ure can be used to check instrument performance without removing side covers or ma king internal adjustments by performing all p ortions excep t the ADJU ST part of the steps . Screwd river a d justments whic h are accessible without removing the covers are adjusted as part of the perfo r mance chec k procedure. Α note titled PERF ORM ANC E CHE CK ONLY gives instructions wh ich are app licable only to the p erformance chec k proced ure. Completion of each step in the com p lete P erformance Check/Calibratio n Proced ure insures that this instrument meets the electrical specifications given in Section 1 . F or best overall inst rument performance, wh en performing α complete cali bration proced ure, ma ke each ad justment to the exact setting even if the C HE C K is within t h e allowable tolerance. Α Short- Form Proced ure is given prior to the complete p roce d ure. To facilitate instrume nt calibration, for the experienced calibrator, the Short- F orm P roce d ure lists the calibration a d justment necessary for each step and the a p plica ble tolerances . This p rocedure also inclu d es the step number an d title as listed in the complete P erformance Check /Calibration Proced ure an d the p age number on which each step begins . Therefore, the Short- Form Proced ure can be used as an in d ex to locate α ste p in the complete p roce d ure. Anoth er feature of the Short- Form Proced ure is the spaces p rovi d ed to record performa nce d ata or to chec k off steps as they are com pleted . This procedure may be reproduced a nd use d as α p ermanent record of instrument cali bration . ΝΟΤΕ Α // waveforms shown in this procedure were taken wit h α Te k tr onix Oscilloscope Camera System. L imits, tolerances and waveforms in this procedure are given as calibration guides and sho uld not be interp reted as instrument sp ecifications except as stated in Section 1 .
Α
Α pa rtial calibration is often d esirable after re p lacing α component or to touc h up an adj ustment of α p ortion of the instrume nt between ma jor recali brations . F or partial calibration, set the controls as given under Preliminary Control Settings an d start with the n earest test equi pment p icture preced ing the d esired check or chec ks. If any controls need to be ch anged from the p reliminary settings for th is portion of the cali bration p roce dure, they are listed un d er the h eading Partial P roced ure following the equipme nt requi red p icture . To prevent unnecessary recali bration of other p arts of the instrument, read ju st only if the tolera n ce given in the CHE C K part of the step is n ot met. If read justment is n ecessary, also chec k the cali bration of any ste p s listed in the I NT ER ACTION part of the ste p . TEST
E QU IPMEN T RE QUI RE D
General Th e following test eq ui pment and accessories, or its e q uivale nt, are re quired for com p lete cali bration of the 71370. S p ecifications given are the minimum necessary for accurate cali bration . Therefore, some of the recommen ded e q ui pme nt may h ave specifications wh ich exceed those given. All test eq uipment is assume d to be correctly calib rated an d o perating within the given s p ecificatio ns. If e q uipment is substitute d , it must meet or exceed t he specifications of the recommen d ed eq ui pment . S p ecial Te ktronix calibration fixtures are used in th is proce d ure only where they facilitate cali bratio n . These special calibration fixtures are available from Te ktro nix, Inc. Or d er by p art number throug h your local Te ktronix F ield Office or rep resentative . 1 . Test time-base compatible with the Te ktronix 7700-series oscilloscope . 7Β71 used in these chec ks. 2. Vertical am plifier (2 each) for use with Tektronix 7000-series oscilloscopes . B andwidt h, 200 MH z or greater; d eflection factor, 5 volts to less than 50 millivolts . Te ktronix 7Α16 use d in these chec ks. 3. Oscillosco p e. Te ktronix 7704 . 4 . P lug-in extender . Te ktron ix P art N um b er 067-0589-00.
P erformance Check/Calibration-71370 5 . L ow-f requency si ne-wave generator. Frequency r ange, 20 h ertz to greater than 50 kilohertz ; output amplitu de, 150 millivolts to 5 volts. F or exam ple, General Rad io M odel 1310-Α Oscillator . 6. Constant am plitu d e si ne-wave generator. Reference freque ncy, 50 kilohertz ; frequency range, 10 mega hertz to 100 megahertz ; outpu t am plitud e variable from 150 millivolts to 5 volts. Te ktronix Type 191 recommended . 7. Time-mar k generator . M ar ker outputs, five second s to five nanoseco nds ; ma rker accuracy, within 0.1%. Te ktronix Type 184 Time-Mark Generator recommended . 8. Calibration F ixtu re, Co nstant Am p litud e Signal Generator . R eference frequency, 3 megahertz ; frequency range, 65 mega hertz to above 200 megahertz ; output am plitu d e, 0.5 to 5 volts peak to pea k into 50 ohms ; amplitud e accuracy, output am plitude co nstant with in 1% or 3 mega hertz reference as output frequency changes. Te ktronix Part N umber 067-0532-01 . 9. Stan dard Amplitu d e Cali brator. Freq uency, 1 kH z; output am plitu d e, 0.5 mV to 50 V peak to peak in α 1-2-5 step se quence; amplitude accuracy, ±0 .25% . Tektronix calibration fixture 067-0502-00 recommended . 10 . 10 Χ p robe. Tekt ron pc Ty p e Ρ6053 recommended . 11 . Ca ble (2 each) . Co nn ectors, BN C; Imped ance, 50 oh ms ; le ngt h , 42 i n ch es . Te ktronix P art N umber 012-0057-01 . 12 . BN C Τ connecto r . Te ktronix P art 103-0030-00.
N umbe r
13 . 50 ohm feedth rough te rmination (2 each ) . Te ktronix Part N umber 011-0049-01 . 14 . A d apte r . G R to BN C female . Te ktronix Part N umber 017-0063-00. 15 . 1 Χ Probe (2 each) . Te k tronix Ρ6011 probe recommen d ed .
S HORT- FORM PR OC E DURE 71370 Cali
b ration
Date
Cali brated By 5-2
1 . A d just Up p er Positive Slope Ρ-Ρ AUTO Level (R251)
P age 5-5
R e q ui rement: Stable triggeri ng on α 0.5 d ivision 50 kH z signal with the LEVEL/S LOPE control set to 11 :30.
P erfo rmance: Correct
; Incorrect
2. Adjust L ower Positive Slope Ρ-Ρ AUTO L evel ( R258)
P age 5-5
Req uiremen t: Stable triggeri ng on α 0.5 d ivision 50 kH z signal with th e LEVEL/S LOPE cont rol set to 6:30.
Performance : Correct- ; I ncorrect 3. Adj ust ( R 155)
N egative Slope Ρ-Ρ A UTO Level
Page 5-5
Requirement: Stable triggering on α 0.5 division 50 kH z signal wit h t he LEVEL/S LOPE cont rol set to the negative slo p e.
Performance : Correct- ; Incorrect 4. Chec k A UTO Triggering Sensitivity
P age 5-5
Requirement : Stable triggering on α 0.3 division 50 kH z signal with the LEVEL/S LOPE control set near 9:00 and 3:00.
P erforma nce : Correct- ; I ncorrect 5. Chec k Normal Triggering Sensitivity
P age 5-5
R eq uirements: Stable triggering on α 0.3 d ivision 50 kH z sign al with the LEVEL/S LOPE control set near 9:00 an d 3:00.
Performance : Correct- ; Incorrect_ 6. Ad just DC
L evel Center (R 121)
P age 5-6
R equirement : Stable triggering on α 0.3 division 50
kH z signal with LEVEL /S L O PE near 9:00 and CO UPLI NG set to DC .
Perfo rma nce : Correct- ; Incorrect 7 . Chec k Si ngle Swee p Mode
P age 5-6
Requirement : After each swee p, further d is plays are RE S E T button is pressed .
lock ed out u n til th e
Performance : Correct- ; Incorrect
P erformance Check/Calibration-71370 8 . Adj ust E xternal H orizontal Amplifier B alance ( R 186)
Page 5-6
15 . Chec k Amplifier VAR IA BLE Range
R equireme n t: W ith all SO UR CE buttons cancelled, a d just for no moveme nt of dot as VAR IA BLE is rotated .
R equirement : W ith VAR IA BLE fully cloc kwise, apply an eigh t d ivisio n signal . Turn VARIA BLE fully countercloc kwise, chec k for 0.8 d ivision or less d is p lay.
Performance : Correct
Performance : Correct
; Incorrect
9. Adj ust E xternal Input B alance (1337)
P age 5-6
; I ncorrect
Page 5-10
16 . Check Line Trigger Source
R eq uirement : Ad justed for no movement of d ot as V AR IA BLE control is rotated .
R eq uirement : Stable trigge ring of the p ro p er p olarity on t h e positive and negative slo p e of the LEVEL / SLO PE control .
Performance : Correct- ; Incorrect
Performance : Correct- ; Incorrect
10 . Ad just E xternal I n p ut Gain ( R25)
P age 5-6
R equirement : With α one volt signal applied to t he
ΕΧΤ TR IG IN co nnector, the push-pull output of t he E xternal I nput Amplifier is 0.2 volt.
Performance : Correct- ; Incorrect 11 . Chec k Horizontal Amplifier Gai n
17 . Chec k/A d just Sweep Calibration (SWP CA L, α front-panel ad just)
Page 5-7
Performance : Correct- ; Incorrect
R equirement : With 1 ms markers app lied an d TIME/ DI V set to 1 ms, check for one marker each division . The seco n d and tenth markers must li ne up with t hei r respective graticule lines.
18 . Ch ec k/A djust M agnified Sweep Gain ( R785)
Page 5-8
Re q uirement: Trigger B and wi d th meets the specifications given in Section 1 . Refer to complete proce d ure.
P erformance : Correct- ; Incorrect list d iscrepancies 13 . Chec k Sweep J itter
; Incorrect
19 . C h ec k /A d just M agnifier R egistratio n (R795)
Page 5-12
R e q ui rement: 0.2 division or less trace shift when switching M AG N I F I ER f rom Χ 10 tο Χ1 .
Peformance: Correct- ; Incorrect P age 5-10
20 . Chec k Sweep
L ength
Page 5-12
Req uirement : No more th an one nanoseco nd of j itter with α 150 MH z signal applied .
R eq uirement : Sweep length must
Performance : Correct- ; Incorrect_
P eformance: Correct
14 . Chec k Horizontal Amplifie r Bandwidth
P age 5-12
R e q uirement : W ith ΤΙΜΕ /DIV at 1 ms, M AG N I FI ER at Χ 10 an d .1 ms markers applied , chec k for one marker each d ivision .
Performance : Correct 12 . Chec k Trigger B an d width
Page 5-11
P erformance : Correct- ; I ncorrect
R equirement : Disp lay is 4 d ivisions ± 0.8 d ivision with α 100 millivolt signal app lied to the ΕΧΤ V O LTS IN connector.
Α
P age 5-10
Page 5-10
13 d ivisio ns.
be between 10 .5 and
; Incorrect
21 . Check Variable Time/Div
Page 5-13
Requirement : No more than -3 dB at 16 h ertz and 100 kilohertz .
R e q uirement : Continuously variable between calibrated settings of the ΤΙΜΕ /DI V switc h.
Performance : Correct- ; Incorrect
Performance : Correct- ; Incorrect5-3
Performance Check/Calibration-71370 22 . Chec k/A djust 5 μs Timing (C530J )
P age 5-13
R equirement: W ith 5 μs markers applied an d TIME/
DI V set to 5 μs, chec k for one mar ker eac h division. The secon d a n d tenth markers must line up with t heir res pective graticule lines.
P erformance : Correct
; Incorrect
23 . Chec k/Adj ust .2 μs Timi ng (C530L )
Page 5-13
Requirement : W ith .1 μs markers app lied and TIME/ DI V set to .2 μs, check for two mar kers each d ivision .
Performance : Correct- ; I ncorr ect 24 . Check Sweep Timing Accuracy
P age 5-14
Req uirement : Accuracy over the ce nter eight d ivisions
is with i n 3%ο from 5 seco nd s/division to 1 second / d ivision ; 2%ο from 0 .5 secon d /division to 0 .02 microseco nd /d ivision . 20 Incorrect
P age 5-14
R equirement : M ag n ified timing accuracy over the center eight d ivision is with in 3.5ο/ο from 5 secon d s/ division to 1 seco nd/division; 2.5ο/ο from .5 second/ d ivision to 0 .02 microsecond/division .
P erformance : Correct- ; Incorrect
P reliminary Control Settings 71370 (Β H orizontal Plug-In Compartment) Centered on Positive LEVEL/S LOPE Slope (9 :00 όclock ) TR IGGER I N G Ρ-Ρ AUTO M OD E AC CO UPLI NG SO UR C E
P OSITIO N
M AG N I F I ER DISPLAY M OD E
P age 5-15
P erformance : Correct- ; Incorrect PERF O RM AN CE C HE CK/CA L I BR ATIO N PR OC EDURE General The following p rocedure is arranged so the 71370 can be calibrated with t h e least interaction of ad justments and reconnection of eq ui pment. Α picture of the test equi p ment requi red for each grou p of steps is given to ai d in identification of the necessary equi pment . The control settings continue from the preced ing ste p (s) unless noted otherwise . The following p rocedure u ses the equipment listed under Test Eq ui pment R equired. If other eq uipment is substitute d, co ntrol settings or cali bration setu p may need to be
ΙΝΤ M id ra n ge Χ1 TIME B AS E μs CAL IN
Fu lly Clockwise
7Α 16 ( Left Vertical Plug-in Compartment)
Mid range
P osition P olarity
Bandwidth Volts/Div Coupli ng in Α
R e q uirement : H ol d off time is 1 .5 times the ΤΙΛΑΕ/DI V setting or less for 5 s/Div to 5 μs/Div; 3.5 μs or less for 2 μs/Div to 0.02 μs/Div.
5- 4
This instrument shou ld be calibrated at an ambient temperature of +250C ±100C for best overall accuracy. If the temperature is outside th e given range, see Section 1 for the applicable tolerances.
V AR IA BLE ΤΙΜΕ /DIV A MPLI F I ER VAR IA BLE
list discrepancies
26 . Ch eck Sweep H ol d off Time
ΝΟΤΕ
ΤΙΜΕ /DI V
Performance : Correct- ;
25 . Chec k Magnified Sweep Timing
altered to meet the req uirements of the eq ui p ment used . Detailed operating instructions for the test equipment are not given in th is p roced ure . R efer to the instruction manual for the test equi pment if more information is req uired .
+ UP Fu ll .5 V AC
713711 (Test Time Base H orizontal Plug-in Compartment)
L evel/Slo pe
Triggeri ng M ode Coupling Source P osition M agnifier Β Delay M ode Time/Div V aria b le Time/Div
Centered on Positive Slope (9 :00 o'clock) Ρ-Ρ Auto AC Int
Midrange
Χ1 Ind epend ent 20 μs CαΙ Ιη
7704 Oscilloscope Α Inte nsity Β Inte nsity Vertical M od e H orizontal M ode Α Trigger Source Β Trigger Source
CCW CCW Left Β V ert M o d e V ert M o d e
Tur n the Oscillosco pe power on a nd a d vance the Α Intensity until α free-r unning trace is observe d . Center the trace with t he h orizontal and vertical P osition controls . Allow several minutes warm up before proceed ing with calibratio n.
P erformance Check/Calibration-71370
F ig . 5-1 . Test e q u i p me nt req uired for ste ps 1 thro ugh 11 .
1 . Adj ust Upp er Position Slo p e Ρ-Ρ AU TO L evel (R251)
Ο
α. Test eq ui p ment req uire d is shown in F ig . 5-1 .
b. ADJU ST-R 155 for α stable d is p lay. R efer to Fig . 5-2 for location of ad justment. Check for stable triggering over the full 360° range of the LEVEL/S LOPE control .
AUTO Triggering Sensitivity
b. Apply 0.5 division of 50 kH z sine wave from t he Type 191 sine-wave generator to the 7Α16 Inp ut connector . Set th e LEVEL/S LOPE control to 11 :30 (near th e to p on the p ositive slo pe) .
4. Chec k
ε. AD JU ST-R 251 for α stable d isp lay. See F ig . 5-2 for location of a d j ustment.
b . C HE C K - F or stable triggering with th e LEVEL / S LOPE control near 3 :00 an d near 9 :00. Chec k for α freerunning sweep at all other p ositions .
Ο 2. Adj ust L ower Positive Slo pe Ρ- Ρ AUTO L evel (R 258) α. R eset the LEVEL/S LOPE control to 6 :30 (near the bottom on the p ositive slope) . b. AD JUST-13258 for α stable d isplay . R efer to F ig . 5-2 for location of ad justment. Ο 3 . Ad just N egative Slo pe Ρ-Ρ AUTO Level (R 155) α. R eset th e LEVEL/S LO PE control to 3 :00 (centered on the negative slo p e) .
Α
α . Set the TR IGG ER I NG MOD E to AUTO . Ad just the Ty p e 191 am p litu d e for α 0.3 d ivision CRT d isp lay .
5. Chec k NO RM A L Triggering Sensitivity α . Set the T R IGGER I N G MOD E to N O RM . b . CHE C K-F or stable triggering near 9:00 and n ear 3 :00. ΝΟΤΕ The 7Α 16 Position control must be set for zero volts DC between interface pins Α 20 and 820 of the 7870 before performing step 6.
5-5
P erformance Check/Calibration-71370
F ig . 5-2 . Locatio n of adjustments on Trigger Board .
6. Adj ust DC
L evel
Center (13121)
Ο
α . Set the LEVEL/S LOPE control near 9 :00 an d ad just for α stable d isplay . b. ADJU ST-C hange the T R IGGER ING CO UPLING to DC an d ad just R 121 for α stable display. R eturn the TR IGGER I N G CO UPL I NG to AC . 7. Chec k SI NG LE
SW EEP M OD E
α. Ad just the LEVEL/S LOPE control for α stable display an d ch ange the T R IGGER ING MOD E to SI NG LE SWEEP .
b. ADJUST-R1186 to br ing the d ot on to the display area . Wh ile rotating the VA R IA BLE control, adjust R 186 for no movement of the dot as the VAR IA BLE control is rotated throug hout its range . 9. Adj ust E xternal In put Am p lifier B alance (1337) α . Set the SO UR CE to EXT .
b . AD JU ST-Wh ile rotating the VAR IA BLE control through out its range, adjust R 37 for no movement of the d ot . 10 . Adj ust E xternal In put Gain (1325)
b. CHE C K- Remove the signal from the 7Α16 . P ress the RE SET button and ch ec k t hat the RE ADY light is lit. R econnect the signal to t he 7A 16 an d ch ec k that the swee p runs one time . At th e en d of t h e swee p t he RE ADY light should go out. ε . Disconnect the signal from the Ty pe 191 . 8.
A
dj ust
E xternal H orizontal
Am
p li-
Ο
fier B alance (13186) α . Set the CO UPL I NG to DC and t he DIS PL AY M OD E to AMPLI F I ER . Set th e SO UR C E switch so t h at all buttons are out (t h is may be accom plished by p ressing lightly on one of the buttons until all the buttons are ca ncelled) . 5-6
Ο
Ο
ΝΟΤΕ Step 10 requires two 7Α 16 amplifiers or α dual trace amplifier such as the 7Α 12. α. Set th e TR IGGE R I NG MOD E to Ρ-Ρ AUTO, DISPLAY MOD E to TIME BAS E an d apply α one volt signal from the stan dard am p litu d e calibrator to the ΕΧΤ TR IG IN co n nector . b. Set t he Oscillosco pe Vertical Mode to Add . Set bot h 7Α16 Volts/Div to 50 millivolts . Set the P olarity switch of the 7A16 in the right vertical compartment to Invert . Connect α 1 Χ p robe from the left vertical p lug-in to p in F on Α
P erformance Check/Calibration-71370
c . ADJUST-R25 for α four d ivision d isp lay on the CRT . 11 . Check Horizontal Am plifier Gain α. R eset the DISPLAY MODE to AMPLIFIER an d turn the am plifier VARIABLE control fully clockwise . Apply α 0.1 volt signal from the stan dar d am p litu d e calibrator to the ΕΧΤ VOLTS IN connector . b . CHECK-Disp lay am plitu d e should be between 3.2
d ivisions an d 4 .8 d ivisions . F ig . 5-3. Location of pins for Calibration Step 10 .
c . R eset the SOURCE switch to EXT -*10 and the stan dard am p litu de calibrator to 1 volt .
t he E xternal In put board an d α 1 Χ p robe from the right vertical p lug-in to pin Η on the E xternal In put board. See F ig . 5-3 for location of p ins.
d . CHECK-Display am p litu de should be between 3 .2
d iv isions and 4.8 divisions .
N OTES
Performance Check/Calibration-71370
0+;τ- ο5 32 -"χ, F i χ + u re
P_NC ''T" Co nn ect αε
F ig . 5-4. Test eq uipment re quire d for Steps 12 thro ugh 15 .
Partial Proced ure
If beginning α partial p rocedure wit h t his step, set the controls as given un der P reliminary Control Settings exce pt as follows :
Band wi dth
b . Set the controls as given under P reliminary control settings exce pt as follows: 10 ms
ε . Connect α 30 Hz sine wave from the low-frequency sine-wave generator th roug h α "Τ" connector an d coaxial cable to the 7A 16 In put an d from the other si de of the "Τ" connector th roug h α coaxial cable an d α 2Χ atten u ator to the ΕΧΤ TR IG IN connector. Adjust the sine-wave generator for α 0.5 d ivision display on the C RT. d . C HE CK -U sing the control settings in Table 5-1, chec k for stable triggering and α lit TR IG'D lamp for each 5- 8
Sine-Wave Generator
71370
α. Test eq ui pment req uire d is shown in Fig . 5-4.
7 Β 70 ΤΙΜΕ /DI V
TA BL E 5-1
10 ms
ΤΙΜΕ /DI V 12 . Chec k Trigger
co nd ition listed . U se the ΤΙΜΕ /DI V control as necessary for ορ tίιτιυ m viewing of d isp la y.
CO UPLING
SO UR CE
AC AC HF REJ DC AC LF REJ AC HF REJ AC AC Hf DC AC LF REJ AC HF REJ
ΙΝΤ ΙΝΤ ΙΝΤ ΙΝΤ ΙΝΤ ΕΧΤ _E_X _ T ΕΧΤ ΕΧΤ ΕΧΤ
Freq uency 30 30 30 30 50 30 30 30 30 50
Hz Hz Hz Hz Hz Hz Hz Hz Hz Hz
Am plitu de 0.5 d iv 0.5 d iv 0.5 d iv 0.5 d iv 0.5 d iv 125 mV __1_2_ 5 mV 125 mV 125 m V 125 m V
e . C hange the "Τ" connector from the low-frequency generator to the Type 191 signal output connector (usi ng α G R to BN C adapter) . Set the Ty pe 191 frequency to 20 MHz an d ad just the amplitude for 125 millivolts . Ο
Performance Check/Calibration-71370 f . CHECK-Using the control settings in Table 5-2, check for stable triggering an d α lit TRIG'D lamp for each condition listed .
TABLE 5-2 71370
Type 191
COUPLING
SOURCE
DC AC AC LF REJ DC AC AC LF REJ
ΕΧΤ ΕΧΤ ΕΧΤ ΙΝΤ ΙΝΤ ΙΝΤ
Fre q uency 20 20 20 20 20 20
MHz MHz MHz MHz MHz MHz
Amp litude 125 mV 125 mV 125 mV 0.5 d iv 0.5 d iv 0.5 d iv
g. Change the "Τ" connector from the Type 191 signal generator to the 067-0532-01 Calibration F ixture output connector. Set the Calibration F ixture frequency to 200 MHz and adjust the amplitude for α 1 .5 d ivision d is p lay.
h . CHECK-Using the control settings in Table 5-3, check for stable triggering and α lit TRIG'D lam p for each con d ition listed .
TABLE 5-4 71370 COUPLING
SOURCE
Freq uency
Amplitude
AC AC HF REJ DC AC LF REJ AC HF REJ AC AC HF REJ DC AC LF REJ AC HF REJ
ΙΝΤ ΙΝΤ ΙΝΤ ΙΝΤ ΙΝΤ ΕΧΤ ΕΧΤ EXΤ ΕΧΤ ΕΧΤ
30 Hz 30 H z 30 Hz 30 kHz 50 kHz 30 H z 30 Hz 30 H z 30 kHz 50 kHz
0.3 d iv 0.3 d iv 0.3 div 0.3 d iv 0.3 d iv 75 mV 75 mV 75 mV 75 mV 75 mV
k . Change the "Τ" connector from the low-frequency generator to the Ty p e 191 signal generator output connector (using α G R to BNC adapter) . Set the Type 191 freq uency to 20 MHz and adjust the amplitud e for 75 millivolts.
Ι . C HECK-Using the control settings in Table 5-5, check for stable triggering and α lit TRIG'D lamp for each con d ition listed .
TABLE 5-3 7Β70
Calibration Fixture
COUPLING
SOURCE
AC DC AC LF REJ AC DC AC LF REJ
ΙΝΤ ΙΝΤ ΙΝΤ ΕΧΤ ΕΧΤ ΕΧΤ
Fre q uency 200 200 200 200 200 200
MHz MHz MHz MHz MHz MHz
Amplitu d e 1 .5 d iv 1 .5 d iv 1 .5 d iv 375 mV 375 mV 375 mV
Sine-Wave Generator
TABLE 5-5 71370
Ty pe 191
COUPLING
SOURCE
DC AC AC LF REJ DC AC AC LF REJ
ΕΧΤ ΕΧΤ ΕΧΤ ΙΝΤ ΙΝΤ ΙΝΤ
Freq uency 20 20 20 20 20 20
MHz MHz MHz MHz MHz MHz
Amplitude 75 mV 75 mV 75 mV 0.3 d iv 0.3 div 0.3 div
i. Change the "Τ" connector from the 067-0532-01 calibration fixture to the low freq uency sine-wave generator output connector. Ad just the sine-wave generator for α 0.3 division dis p lay . R eset the TRIGGERING MODE to N ORM.
m. Change the "Τ" connector from the Type 191 signal generator to the 067-0532-01 Calibration Fixture output connector. Set the Calibration F ixture frequency to 200 MHz and adjust the amplitud e for α 0.3 division d isplay .
j . CHECK-Using the control settings in Table 5-4, check for stable triggering and α lit TRIG'D lamp for each condition listed .
η . C HECK-Using the control settings in Table 5-6, check for stable triggering and α lit TRIG'D lam p for each con d ition listed . 5- 9
P erformance Check/Calibration-71370
TA BLE 5-6 Calibration F ixture
71370 CO UPLI N G
SO UR CE
Freq uency
AC DC AC LF REJ AC DC AC LF REJ
ΙΝΤ ΙΝΤ ΙΝΤ ΕΧΤ ΕΧΤ ΕΧΤ
200 MH z 200 MH z 200 MHz 200 MHz 200_ MH z 200 MH z
13 . Chec k Swee p
Amplitu d e 1 .5 d iv _ 1 .5 d iv 1 .5 d iv 375 mV 375 mV 375 mV
J itter
α . Set the 067-0532-01 Calibration F ixture to 150 MH z an d a d just the am p litu d e for α four d ivision disp lay. b . Set th e 7870 ΤΙΜΕ /DI V to .02 microsecon d , MAG N I F I ER to Χ 10, an d SO UR CE to INT. F ig . 5-5. Location of interface co nn ector Α4.
c . CHE CK- For no more t h an 0.5 d ivision (1 nanosecond) of j itter. Disregar d any slow drift.
erator .
d . Disconnect the Calibration Fixture . 14 . C hec k Horizontal Am p lifier
c . R eturn the VAR IA BLE control to its fully cloc kwise
p osition . Disconnect the low-frequency sine-wave gen-
Ban d wi d t h
16 . Chec k Line Trigger Source α . C hange the control settings as follows:
α. R eset the SO UR CE to ΕΧΤ, CO UPL I N G to AC an d
PLAY from th e DIS
M OD E
low-fre
to A
M PL I F I ER .
q uency
sine-wave
kH z signal to th e ΕΧΤ
Connect α 1 generator
VOLTS IN connector and ad j ust the sine-wave generator am p litu d e for six horizontal d ivisions of d isp lay on the C RT . b. CHE CK-R eset the sine-wave generator to 100 kH z for α d is p lay amplitu d e of at least 4 .2 d ivisions .
d c h ec k
an
15 .
C
h ec k
Am
p lifier
V A R IA BLE R ange
DIS
PLAY M OD E V
71370
ΤΙΜΕ /DI
T R IGGER I N G MOD E CO UPL I N G SO U RCE
TIME B AS E 5 ms NO RM AC LI N E
7 Α 16
V olts/Div Cou p ling
1
V
AC
α. Ad just the sine-wave generator for an eight d ivision h orizontal display on th e CRT. (T he VA R IA BLE control must be set fully cloc kwise .)
b. Connect α p robe from the 7Α 16 In put to interface connector Α4 ( p lug-in connector at the rear of the 7 Β70). See Fig . 5-5 .
b . C HE C K - R otate t h e V A R IA BLE control fully cou n terclockwise and c hec k for 0.8 d ivisio n or less of h orizontal d is p lay.
ε . CHE C K -F or stable triggeri ng of the p roper p olarity with t he LEVEL/S LOPE control set to the positi ve slo p e an d to the negative slo p e.
P erformance Check/Calibration-71370
F ig . 5-6. Test eq uipment req u ired for Step s 17 throug h 25 .
d. CHE C K-C RT d isplay for one 1 ms marker for eac h
Partial Procedure
If beginning α p artial p roced ure with t his ste p , set the controls as given un d er P reliminary Control Settings exce p t as follows :
division between the secon d an d tent h vertical lines (see Fig . 5-7) .
7 Α 16 2 V O L TS/DI V
V 71370
ΤΙΜΕ /DI V
1 ms
17 . Chec k/A djust Swee p Calibration (S WP CA L, α front- panel a dj ustment)
α. Test e q ui p ment re q uire d is shown in Fig . 5-6. b. Set the ΤΙΜΕ /DI V to 1 ms, source to ΙΝΤ an d T RIG
b. Set the ΤΙΜΕ /DIV to 1 ms, source to ΙΝΤ an d T R IGG ER I NG MOD E to Ρ- Ρ AU TO . ε. Apply 1 ms markers from the Type 184 time-mar k generator to the 7Α 16 In put .
F ig . 5-7. C RT display showing S WP CA L ad ju st ment correctly set.
5- 1 1
Performance Check/Calibration-71370 ε. C HE C K-Set th e MAG N I F IE R to Χ 1 and chec k that the midd le mar ker remains at th e center vertical line . See F ig . 5-8Ι3 .
ΝΟΤΕ
Unless oth erwise noted, use the center eigh t h orizontal divisions wh en checking or adjusting timing.
d. ADJ U ST- M ag Regis, R 795, to position the mi dd le marker to the center vertical li n e.
PERF O RMA NCE CHE C K ONL Υ
Frontpanel adjustment,- can be adjusted as part of th e performance check.
e . ADJU ST-SWP CA L, α front- p anel ad just, for one marker for each division . The secon d an d tent h markers must line up with t h eir respective graticule lines (use t he horizontal P OSITIO N control as necessary to line up the d isplay). f. CHE CK-T he timing accuracy is with in 5% over any two d ivision interval within the center eight d ivisions .
e . Alternately switch the MAG N I F I ER between Χ 1 and Χ 10 and re p eat step s b throug h e until no sh ift occurs when switching.
20 . Chec k Swee p
L ength
α . Set the time-mar k ge nerator for 1 ms an d .1 ms mar k ers . Reset th e MAG N I F I ER to X1 and the 7A16 Volts/Div to 2 V.
g. I NTER ACTION : Chec k Ste p s 18 throug h 25. 18 . Check /Ad just Gain ( R785)
Magnifie d Swee p
Ο
α. Set the time-mar k generator for .1 ms markers. b. Set the MAG N I F I ER to Χ 10 .
ε. C HE CK-C RT d is p lay for one .1 ms marker for each d ivision between the secon d an d tenth vertical lines. d. AD J UST-R785, Magnifier Gain, for one marker for each d ivision . The second and tenth markers must coinci d e exactl y with th eir resp ective graticule lines (use the h orizontal POSITIO N co ntrol as necessary to line up th e display) .
r ι~
ι
e. CHE CK-Timing accuracy is wit hin 5°/ο over any two
d ivision interval with in the center eight d ivisions . f. I NTER ACTION : Chec k ste p s 19 an d 25 . 19 . Chec k/A d just M agnifier R egistration ( R795)
Ο
α. Set th e time-mar k generator for 5 ms mar k ers. Set th e 7Α16 Volts/Div to 1 V. b . P osition the mi dd le marker to th e center vertical line (t here are th ree markers on the total magnifie d swee p) wit h the h orizontal POSITIO N control. See F ig . 5-8Α. 5- 1 2
F ig . 5-8. CR T disp lay showing correct magnifier registration. (Α) MAG NIFI ER set to Χ10 an d ( Β) MAG N I F I ER set to Χ1 .
P erformance Check/Calibration-71370
UM MMMMMMMMMM M M
MENEM MMMMMJM~M~MM M MEMNEEMMEN
No 0 M
MENNEN MEMMEM MENNEN
0
M
0
ME
No
F ig . 5-9. CRT d isplay when check ing sweep le ngth.
F ig . 5-11 . CRT display showi ng correct 5 μs timi ng .
b. Move the eleventh 1 ms marker to the center vertical line with the horizontal P OSITIO N control . See F ig . 5-9.
ε . CHE CK-C RT d isp lay for α two- division maximum spacing between markers (ind icates ad equate range for continuously variable swee p rate between the calibrated steps ; see F ig . 5-10) . Return the VAR IA BLE ΤΙΜΕ /DI V to the CA L IN position .
ε. CHE CK-Sweep length must be between 10 .5 an d 13
d ivisions .
21 . Check Variable Time/Div α. Reset the ΤΙΜΕ /DI V to 2 ms . Set the time-mark generator for 10 ms mar kers. b. Press an d release the VAR IA BLE ΤΙΜΕ /DI V knob an d turn fully counterclockwise .
SMMMMMMEMN EMEMEMEMEM EMEMEMEMEM MEMMEMEMEMI, MEMMMEMEME F ig . 5-10 . Ty pical CRT display w hen checking VAR IA BLE control
range .
22 . Chec k/Adj ust 5 μ s Timing (C530J )
Ο
α. Set the time-mar k generator for 5 μ s markers. b. Reset the ΤΙΜΕ /DI V to 5 μ s an d ad just the LEVEL/ S LO PE for α stable d is play . c . CHE CK-C RT d is play for one marker each d ivision between the second and tenth vertical lines. Chec k t hat swee p timing is within 0.16 d ivision (2%) over the center eig h t d ivisions . $ee F ig . 5-11 .
d . ADJU ST-C530J for one marker eac h d ivisio n . The second and tent h markers must coincide exactly with their respective graticule lines.
23 . Chec k/Adjust .2 μ s Timing (C530L)
Ο
α. Set the time-mar k generator for .1 μs mar kers. b., Set th e ΤΙΜΕ /DI V to .2 μs. ε. C HE CK-C RT d is play for two markers each d ivision over the center eight d ivisions . Chec k that swee p timing is 5- 1 3
Performance Check/Calibration-71370
with in 0.16 d ivision (2%) over center eight d ivisions . See F ig . 5-12 .
d . AD JU ST-C530L fo r two markers eac h d ivision . The mar kers at the seco nd and tenth vertical lines must coinci de exactly with th eir respective graticule lines (use the horizontal P OSITIO N control as necessar y to li ne up the display). 24 . Chec k Swee p Timing Accuracy α. U si ng t he control settings given in Table 5-7, check swee p timing accuracy over th e center eight d ivisions of the display is within the allowable limits .
that
F ig . 5-12 . C RT display showing correct 0.2 μs timi ng.
TA BLE 5-7 71370 ΤΙΜΕ /DIV 0.02 μs .05μ s .1 μs .2 μs .5/1s 1 As 2 μs 5 μs lops 20 μs 50 μs .1 ms .2 ms .5 ms 1 ms 2 ms 5 ms 10 ms 20 ms 50 ms .1 s .2s .5s 1 s 2s 5s
M arkers/ Div
Allowable E rror
1 20 ns 1 50 ns 1 .1 μs 2 .1 As 1 .5 μs 1 μs 1 1 μs 2 1 5 μs s-1 μ 10 2 10 μs 1 50 μs 1 .1 ms 2 .1 ms 1 .5 ms 1 1 ms 2 1 ms 5 ms 1 1 10 ms 10 ms 2 50 ms 1 1 .1 s 2 .1 s 1 .5s 1 1 s 2 1 s 1 5s
±0 .16 d iv ±0 .16 6ν ±0 .16 d iv ±0 .16 d iv ±0 .16 d iv t0 .16 d iv ±0 .16 d iv ±0.16 d iv ±0.16 d iv ±0 .16 d iv ±0 .16 d ίν ±0 .16 d iv ±0 .16 d iv ±0 .16 d iv ±0 .16 div ±0 .16 d iv ±0 .16 d iv ±0 .16 d ίν t0 .16 d iv ±0.16 div ±0 .16 div ±0 .16 div ±0 .16 div ±0 .24 d iv -!-0.24 d iv ±0 .24 d iv
Type 184 M ar k ers
25 . Chec k Magnified Swee p Timing
'
α. CH EC K-With the M AG N I F I ER set to Χ 10, use th e control settings given in Table 5-8 to chec k timing accuracy over the center eight d ivisions . 5- 1 4
TA BLE 5-8
ι
71370 ΤΙΜΕ /DIV
T ype 184 M ar kers
.02 μs .05 μs .1 μs .2 μs .5 μs 1 μs 2 μs 5 μs lops 20 μs 50 μs .1 ms .2 ms .5 ms 1 ms 2 ms 5 ms 10 ms 20 ms 50 ms .1 s .2s .5s 1 s 2s 5s
10 ns 5 ηsι 10 ns 20 ns 50 ns .1 μs .1 As .5 μs 1 As 1 μs 5 μs lops lops 50 μs .1 ms .1 ms .5 ms 1 ms 1 ms 5 ms 10 ms 10ms 50 ms .1 s .1 s .5s
Mar kers/ Div
Allowable Error
1 cycle/5 d iv 0.13 d iv /5 d iv ±0 .2 d iv 1 1 ±0 .2 div 1 ±0 .2 d iv 1 ±0 .2 d iv 1 ±0 .2 div 2 ±0 .2 d iv 1 ±0 .2 d iv 1 ±0 .2 d iv 2 ±0 .2 d iv 1 ±0.2 d iv 1 ±0 .2 div 2 ±0 .2 div 1 ±0 .2 div 1 ±0 .2 d iv 2 ±0 .2 d iv ±0 .2 d iv 1 1 ±0 .2 d iv 2 ±0 .2 div 1 ±0 .2 d iv 1 ±0 .2 d iv 2 ±0 .2 d iv 1 ±0 .2 div 1 ±0 .28 d iv 2 ±0 .28 d iv 1 ±0 .28 div
Type 184 H.F . Selector outpu t.
b . R eset the M AG N I F I ER to Χ1 . Discon nect the timemark generator.
Perfo rmance Check/Calibration-71370 26 . Chec k Sweep Hol doff Time α: Com
Insert th e test time base in th e Α Horizontal P lug-in p artment . Ch ange the control settings as follows :
ΟΟη
7Α 16
V olts/Div
.2
V
71370
TR IGG ER I N G M OD E CO UPL I N G
Ρ-Ρ A AC
SO UR CE DISPL AY MOD E ΤΙΜΕ /DIV MAG NIF I ER
U TO
ΙΝΤ TIME B AS E 2 μs Χ1
Test Time Basel Centered on Positive Slope
L evel/Slope
T r iggering
N orm AC 1 nt I nd epen dent Χ1 5 μs
Mode
Coupling Source Β Delay Mode Mag nifier Time/Div 7704 Vertical Mode H orizontal Mode Α Trigger Source Β Trigger Source
Left Α Left Vert Rig ht Vert
Ζ if α test time base other than the 71371 is u sed, refer to the inst ructio n ma nu al for the time base bei ng used for appr opriate control settings .
Fig . 5-13. CRT display when checking sweep holdoff ti me. b. Connect α 10 Χ pro be from the 7Α16 to ΤΡ 566 on
the 71370 Sweep Generator Board .
ε. CHECK-The hol doff ti me is 3.5 μs or less (see Fig . 5-13).
d. Check the holdoff time at each ΤΙΜΕ /DI V setting for th e following perfo rma nce limits : 5 s/DI V to 5 μs/DI V setting or less
.2 μs/DI V to .02 μs/DI V
1 .5 times the TIME/ DI V 3.5 μs or less
T his comp letes the cali br ation of the 71370 Time
B ase.
PARTS b rass
L IST ABBREV IATIO N S int
internal
bin d ing h ead steel
Ig
length o r long
cap.
capacitor
met .
metal
cer
ceramic
mtg hd w
m ounting h ard ware
comp
composition
OD
outsi d e d iameter
cοππ
connector
ΟΗΒ
oval h ea d br ass
CRT
catho d e-ray tube
OHS
oval h ea d steel
csk
co u ntersunk
Ρ/Ο
p art of
DE
d ouble end
ΡΗΒ
pan h ea d
d ia
d iameter
ΡΗ 5
pan h ea d steel
d iv
d ivision
plstc
p lastic
electrolytic
PMC
elect.
pape r, metal cased
poly
p olystyrene
p rec
precision
PT
p aper, tubular
ΒΗΒ
bin d ing h ead
ΒΗ 5
b rass
EM
e l ectrolytic, metal case d
EMT
electrolytic, m etal tu b ular
ext
external
ΡΤΜ
paper or plastic, tubular, molde d
F & Ι
focus and intensity
R ΗΒ
round h ea d
FHB
flat h ea d b rass
R HS
round h ea d steel
FHS
flat h ea d steel
SE
single en d
Fil ΗΒ
fillister h ea d
5 Ν or S/ Ν
serial nu mber
Fil Η 5
fillister hea d steel
5 or SW
switch
h
height or h igh
TC
temperature compensate d
hex .
hexagonal
ΤΗΒ
truss hea d b rass
ΗΗΒ
h ex h ead brass
thk
thick
HHS
h ex h ead steel
ΤΗ 5
truss hea d steel
ΗSΒ
hex socket br ass
t ub .
tubular
H SS
hex soc k et steel
var
variable
1D
inside
ω
wi d e or wi d th
inc
incan d escent
WW
wire-wound
C
b rass
d iameter
b rass
PARTS ORDERING INFORMATION R ep lace m ent pa rts a r e available f r o m o r t h ro u g h Office o r r e pr esentative .
yo ur local Te k tronix, Inc,
F iel d
C h anges to Te k t r o n ix i n str um e n ts a r e someti m es m a d e to accom m odate i mpr ove d com p onen ts as they become available, and to give you t h e b enefit of t h e latest ci r cuit im p rovements d evelo pe d in o ur e n ginee r i n g d e p a r t m e n t . It is t h e r efo re ί m p a r tant, when ordering parts, to incl u de t h e following information i n yo u r or d er : P art numbe r , instr u me n t type or n u m b er, serial o r mo d el number, and modif ί cation n u mber if a pp licable .
i
If α p a r t you h ave orde r ed h as been rep laced wit h α new o r mpr oved part, your local Te k t ronix, I n c. F ield Office o r r e pr ese ntative wi l l contact you co n ce r n ί ng any cha n ge i n pa rt n u mber ,
S PE CIAL NOTES
X0 0 ΟΟΧ *000-0000-00
U se 000-0000-00
AN D
SY MB O L S
Part first a dd ed at t h is serial n u mber Pa r t
r e m oved afte r t h is serial nu mber
Asteris k p reced ing Te k tronix P art Nu mber i nd icates man u fact u red by or for Te k tronix, Inc ., or rewor ke d or c h ec k e d com p onents . Pa rt n u m b e r
in d icate d is di r ect replace m ent .
I NDEX OF ELECTRICA L PARTS L IST Page No .
Title
C H ASSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-1
. . . . . . . . . . . . . .. . . . . . . . . . . .
ό-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .
6-3
E XT ERN A L TR IGG ER
I
NPU T Circ uit B oar d Assem b ly
Ci rcuit
B oa rd
Assem b ly
INTERFACE Circ u it Board Assembly
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
DIS P LAY MODE Circ u it B oa r d Asse m b ly COU PL I NG Ci r c u it
MOD E Circuit
B oa rd
B oard
Assem b ly
Asse m bly
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ό-13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
-14 TIME B AS E Circ u it B oa r d Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ό SO URC E Circu it Boa r d Assembly
MAGN I F I ER Ci r c u it
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
B oa r d Assem b ly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
Digitally signed by http://www.aa4df.com
SECTION 6
ELECT RICAL PARTS LIST Tektronix Part No .
C k t. ΛΙο.
Se rial/ M odel No . Disc
Desc riptio n
E ff
C H ASSIS Bu lbs
DS347
I n ca ndesce n t #683, selected
*150-0048-01
Ca p acitors Tole r a n ce
::!--20 0/.
un less oth erwise
i nd icated .
10 μ F 1 μF 0.1 μ F 0.01 μ F 0.001 μ F
C530A C530 B C530Ti E *295-0122-00 C530 F C530 H
m i n g ca pacitor assembly
Co n necto r J1
Rece ptacle,
131-0955-00
elect r ical, BN C
R esisto rs Resisto rs
R14613 R 194 R740
~ R 744B
~ R744B
a re fixe d , com positio n, ±10% un less oth erwise i ndicate d . V ar 10 kΩ, 1 kΩ, Va r 500 Ω, V ar
*311-0972-00 311-0091-00 311-0486-00 *311-0965-00
8010100
311-1162-00
Β110000
Β109999
10 kΩ,
Switch
W i red o r
Un wi r ed
$146`
' Furnished as α un it wit h 5146 .
'Furnished as α un it with R 146A,B .
10 kΩ,
Var Var
Electrical Parts List-71370 EXTERNAL I NPUT Cίmuit Board Assembly
C kt. No .
Tektronix Part No.
Se rial/Model No . Ε# Disc
*670-1144-00
Description Complete
B oard
Ca pacitors Tole ran ce ±20% un less ot herwise indicated. CI C2 C3 C5 C6
281-0592-00 283-0068-00 283-0080-00 281-0718-00 283-0080-00
4.7 p F 0.01 μF 0.022 μF 15 .8 pF 0.022 μF
Ce r Cer Ce r Cer Cer
200 V 500 V 25 V 500 V 25 V
+800/. -20 0/. 10/. +800/.-20%
C10 C12 C13 C15 C31
281-0632-00 281-0653-00 281-0592-00 281-0610-00 283-0156-00
35 pF 3.3 pF 4.7 pF 2.2 pF 1000 p F
Cer Cer Ce r Ce r Ce r
500 V 200 V 200 V 200 V 200 V
1% ±1 pF ±0 .5 pF ±0.1 pF 10%
C39 C55 C57
283-0156-00 283-0080-00 283-0080-00
1000 pF 0.022 μF 0.022 μF
Ce r Ce r Ce r
200 V 25 V 25 V
10% +80%-20% +80%-20%
-~0.5 pF
Semico nductor Device, Diodes CR15 VR25
152-0246-00 1 152-0127-00
Silicon Ze ner
Low leakage 250 mW, 40 V Ν755Α 400 mW, 7.5 V, 5%
R elays
Κ3 Κ6
*148-0035-00 *148-0034-00
Armature, spd t, 15 V, DC Armature, dpdt, 15 V, DC
Transistors Q20A,8 Q30 Q37
151-1009-00 151-0221-00 151-0221-00
Silico n Silico n Silicon
Dual, FET 2Ν4258 2N4258
Resistors R esisto rs R1 R2 R5 R7 R8
a re fixe d, composition, ±10% un less ot herwise indicated. 317-0270-00 317-0101-00 323-0452-00 321-0452-00 321-0448-00
27 Ω 100 Ω 499 41 499 kΩ 453 42
'/s W 1/θ W '/τ W %W %W
Prec Prec Prec
5% 5% 1% 1% 1%
E lectrical Parts List7870
E XT ERN AL C kt . No .
Tektronix Part No .
I NPU T
Circ u it
d
Boar
Assembly
(cont)
Serial/Model No . Disc Eff Resistors
Description (cont)
RIO R 11 R 12 R 15 R 16
317-0390-00 321-0361-00 317-0270-00 317-0100-00 317-0270-00
39 Ω 56.2 kΩ 27 Ω ion 27 Ω
R 20 R 22 R 23
317-0101-00 317-0392-00 317-0391-00 311-0634-00 317-0392-00
100 Ω 3.9 kΩ 390 Ω 500 Ω, Var 3.9 k Ω
'/Θ W ΥΘ W W
5% 5% 5%
W
5%
R 27 R 28 R 31 R 33
317-0270-00 317-0101-00 317-0331-00 321-0185-00 317-0360-00
27 0 100 Ω 330 Ω 825 Ω 36 Ω
1/Θ W 1/8 W 1/8 W 1/8 W '/Θ W
5% 5% 5% 1%ο 5%
R 36 R37 R 39
321-0174-00 311-0634-00
634 Ω 500 Ω,
R 25 R 26
R34
3300
317-0331-00
TRIGGER Circuit *670-1136-00 *670-1136-01 *670-1136-02
Β010100 Β019999 Β020000 Β029999 Β 030000
Board
Va r
W W W W W
W
Prec
Prec
Prec
VΘ W
5% 1% 5% 5% 5%
1%
5%
Assembly
Complete B oard Complete Board Complete B oard
Capacitors Tolerance ±20% unless otherwise indicated . C48 C100 C104
283-0000-00 281-0544-00 281-0544-00
0.001 μF 5.6 pF 5.6 pF
Cer Cer Cer
500 V 500 V 500 V
C108
283-0000-00
0.001 ,ιι F
Cer
500 V
C106
0.001 μF
283-0000-00
Ce r
C129
290-0134-00
22 μF
E lect.
C141
281-0593-00
3.9 p F
Ce r
C138 C147 C150
C156 C170 C171
C173 C176' C176
0.01 μ F
283-0079-00 281-0593-00
3.9 pF 33 p F
281-0629-00
281-0629-00 281-0534-00 281-0534-00
283-0000-00 281-0509-00 281-0552-00
33 pF 3.3 pF 3.3 pF
Β010100 Β020000
Β019999
0.001 μF 15 pF 25 pF
500 V
15 V
Cer
250 V
Cer
500 V
Ce r
10% 10%
500 V
10%
600 V
5%
10%
Cer Cer Cer
600 V 500 V 500 V
5% ±0.25 pF ±0.25 pF
Ce r Ce r
500 V 500 V
10%
Ce r
500 V
6-3
E lectrical
Parts List-7670 TRIGG ER Ci rc u it Board Assembly (cont)
C k t. No .
Tektronix P art No .
Se rial/Model No . Disc
Eff
Description
Cap acitors (co n t ) C178 C179 C188 C189 C198
283-0002-00 283-0000-00 283-0114-00 283-0109-00 283-0059-00
0.01 μF 0.001 μ F 0.0015 μ F 27 pF 1 μF
Cer Cer Cer Cer Ce r
500 V 500 V 200 V 1000 V 25 V
5% 5% +80%-20%
C199A C1 99B C200 C201 C203
283-0059-00 283-0059-00 281-0511-00 283-0059-00 281-0511-00
1 μF 1 μF 22 pF 1 μF 22 pF
Ce r Ce r Ce r Ce r Ce r
25 V 25 V 500 V 25 V 500 V
+80%-20% +80%-20% 10% +80%-20% 10%
C204 C207 C209 C210 C212
283-0059-00 283-0080-00 290-0267-00 281-0523-00 281-0523-00
1 μF 0.022 μF 1 μF 100 pF 100 pF
Ce r Ce r Elect . Ce r Ce r
25 V 25V 35 V 350 V 350 V
+80%-20% +80%-20%
C248 C255 C268 C268 C275
283-0010-00 283-0010-00 281-0549-00 283-0604-00 281-0523-00
0.05 μ F 0.05 μ F 68 p F 304 pF 100 p F
Cer Ce r Ce r M ica Cer
50 V 50 V 500 V 300 V 350 V
C303 C312 C315 C319 C320 C320
283-0159-00 283-0080-00 283-0156-00 283-0080-00 283-0103-00 281-0662-00
18 pF 0.022 μF 0.001 μF 0.022 μF 180 pF 10 pF
Ce r Ce r Ce r Ce r Ce r Ce r
50 V 25 V 200 V 25 V 500 V 500 V
50/. +80%-20% 10% +80%-20% 5% ±0 .5 pF
C324
283-0175-00
10 pF
Cer
200 V
5%
C332 C336 C339
283-0159-00 283-0080-00 290-0305-01
18 pF 0.022 μ F 3 μF
Ce r Ce r E lect .
50V 25 V 150 V
5% +80%-20% 10%
1 μF 2.2 1 F
Ce r E lect.
25V 20 V
+80%-20%
C282
C331
C363 C378
Β010100 Β020000
Β019999
283-0002-00
283-0000-00
283-0059-00 290-0136-00
0 .01 μ F
Β010100 Β 070000
Β069999
0 .001 μ F
Ce r
Ce r
10% 2%
500 V
500 V
Semico n ducto r Device, Diodes CR 148 CR 149 C R 181 C R 182 CR 186 C R 190
6-4
*152-0153-00 *152-0153-00 *152-0322-00 *152-0322-00 *152-0075-00 *152-0185-00
Silico n Silico n Silico n Silico n Ge rma n i u m Silico n
Te k S p ec Tek S pec Tek S pec Te k S p ec Tek S pec R e p lacea b le by 1 Ν4152
Electrical Parts List-71370
TRIGG ER Circ u it Board Assembly (cont) Ck t. No .
Te k tr o n ix Pa r t No .
Se rial/ M od el No . Disc
Eff
Description
Semico n ducto r Device, Diod es (co n t)
C R 205 C R 210 CR 212 VR 304 C R 319
*152-0322-00 *152-0322-00 *152-0322-00 152-0154-00 *152-0322-00
Silicon Silicon Silico n Tunn el Silico n
Te k Te k Te k TD Te k
Sp ec Sp ec Sp ec
CR 320 VR 322 CR 331 CR 342 C R355
*152-0185-00 *152-0125-00 *152-0075-00 *152-0185-00 *152-0185-00
Silico n Tunn el Ge r ma n i u m Silico n Silico n
Replacea b le by 1 Ν4152 TD3A 4.7 mA Te k Sp ec Te k Sp ec Replacea b le b y 1N4152 Re p laceable by 1 Ν4152
C R357 VR 358
*152-0185-00 152-0125-00
Silicon Tu nnel
Replacea b le b y 1 Ν4152 Te k Sp ec TD3A 4.7 mA
253 10 mA Sp ec
Relays
Κ44 Κ48 Κ138
Ar mat ur e, dp dt, 15V DC Ar matur e, d pdt, 15 V DC Ar m at u re, d pdt, 15 V DC
*148-0034-00 *148-0034-00 *148-0034-00
I nducto rs L 104
*108-0577-00 *108-0577-00
30 η Η 30 ηΗ
L 141
*108-0369-00
0.12 ριΗ
*108-0369-00 *108-0578-00 *108-0578-00 *108-0579-00
0.12 IιΗ 45 ηΗ 45 ηΗ 120 ηΗ
*108-0580-00 108-0317-00
90 ηΗ 15 μΗ
L 100 L140 L146 L 147
L148 L 149 L l 70 L171
L304
310
L
L318 L318
100 ηΗ
*10$-0581-00 *108-0581-00
100 ηΗ
120 ηΗ
*108-0579-00
*108-0370-00 108-0315-00
Β010100 Β070000
Β069999
0.14 μΗ 0.22 μΗ
Transistors
Q107 Q108 Q110 Q11 6 Q120
151-0220-00 151-0220-00 151-0220-00 151-0220-00 151-0224-00
Silicon Silico n Silico n Silicon Silico n
2Ν4122 2Ν4122 2Ν4122 2N4122 2Ν3692 6- 5
E lectrical
Parts List-71370 TR IGG ER Ci rc u it Board Assem b ly (co n t)
Ck t. No .
Te k t ro n ix P a rt No .
Se r ial/ Mo del No . Disc
E ff
T ra n sistors
Desc r i ptio n (co n t)
Q126 0131 Q134 Q150 Q156
151-0224-00 151-0220-00 151-0220-00 *151-0198-00 *151-0198-00
Silicon Silicon Silicon Silico n Silicon
2Ν3692 2N4122 2N4122 R e placea ble by MPS 918 R eplacea b le by MPS 918
Q158 Q159 Q161 Q168 Q169
*151-0198-00 *151-0198-00 151-0188-00 *151-0198-00 *151-0198-00
Silico n Silico n Silico n Silicon Silicon
R e p laceable R e p lacea b le
by by
0170 Q171 Q181 Q182 Q192
*151-0198-00 *151-0198-00 151-0223-00 151-0223-00 151-0224-00
Silicon Silico n Silicon Silico n Silico n
R e p lacea b le
2N4275 2Ν4275 2Ν3692
b y ΜΡ 5 918 b y MPS 918
Q220 Q221 Q224 Q224 0235
151-0221-00 151-0221-00 151-0223-00 *151-0190-01 151-0221-00
Silico n Silicon Silico n Silico n Silico n
2Ν4258 2Ν4258 2Ν4275 Te k Spec 2Ν4258
0236 0238 Q238 0248 Q255
Silico n Silico n Silico n Silicon Silico n
2 Ν4258 2Ν4275 Te k S pec
Silicon Silico n Silico n Silicon Silico n
2Ν4258 2Ν4122 2Ν4258 2Ν4122 2Ν3692
Silicon Silico n Silico n Silico n Silico n
2Ν3904 2Ν3692 2Ν3904 2Ν4258 Te k Spec
MP S 918 MP S 918
2Ν3906 R e p laceable by MP S 918 R eplacea b le by MP S 918
Re p lacea b le
B010100 Β040000
Β039999
151-0221-00 151-0223-00 *151-0190-01 151-1006-00 151-1006-00
B010100 Β040000
Β039999
Q309 Q309 0317 0317 Q326
151-0221-00 151-0220-00 151-0221-00 151-0220-00 151-0224-00
Β010100 Β 110000 Β010100 Β110000 Β010100
0326 Q328 Q328 0331 Q338
151-0190-02 151-0224-00 151-0190-02 151-0221-00 *151-0190-01
Β110000 B01 0100 Β 110000
Q339 0346 Q348 0350 Q360
151-0220-00 151-0220-00 *151-0192-00 151-0220-00 151-0223-00
Silicon Silicon Silico n Silicon Silicon
2N4122 2N4122 Re p lacea b le by MPS 6521 2N4122 2Ν4275
Q368 Q370 0377
151-0223-00 151-0223-00 151-0223-00
Silico n Silico n Silicon
2 Ν4275 2Ν4275 2Ν4275
BI 09999 Β109999 Β109999
Β109999
FET
FET
Electrical Parts Ust-7B70
TRIGGER Ci rcuit Board Assembly (cont) Ck t. No .
Te ktro nix P art No .
Serial/Model No . Disc
Eff
Description
Resistors R esisto rs
are fixe d, co mpositio n, ±10% un less otherwise ind icated . '/4 W W 1/8 W 1/8 W 1/8 W
Prec Prec Prec Prec
1% 1% 1% 1% 5%
54.9 Ω 54 .9 Ω 56 Ω 47 Ω
'/Θ W '/Θ W '/Θ W '/Θ W
Prec Prec
1% 1% 5% 5%
47 Ω
82 Ω 1 kΩ 464 Ω 30 .1 Ω
1/8 W '/4 W 1/8 W '/2 W '/Θ W
323-0161-00 315-0820-00 321-0193-00 321-0288-00 321-0291-00
4640 82 Ω 1 kΩ 9.76 kΩ 10.5 k Ω
1/2 W 1/4 W W ΥΘ W W
Prec
311-0732-00 321-0282-00 315-0102-00 321-0288-00 321-0293-00
1 k Ω, V ar 8.45 k Ω 1 kΩ 9.76 k Ω 11 kΩ
W W '/Θ W ΥΘ W
Prec
321-0285-00 317-0102-00 315-0152-00 317-0122-00 317-0122-00
9.09 k Ω 1 42 1 .5 42 1 .2 k Ω 1 .2 k Ω
ΥΘ W W 1/4 W ΥΘ W VΘ W
Prec
315-0361-00 315-0102-00
360 Ω 1 kΩ
1/4 W '/4 W
317-0511-00 321-0115-00
510 0 154 12
322-0215-00 322-0215-00 321-0068-00 321-0068-00 317-0560-00
1 .69 kΩ 1 .69 42 49.9 Ω 49.9 Ω 56 Ω
R 106
321-0072-00 321-0072-00 317-0560-00 317-0470-00
R 108
317-0470-00
R 40 R 42
R 47 R49
R 100
R 101
R 103 R 104
R 107
R 110
R111 R 112 R l 13 R
114
Rl 16
R 117
R 119 R 120
R 121
R 122 R 124 R 126 R 127
R 128 R 129
R 130 R 132 R 133
R 135
R 136
R141
R 142
R 143
R l44
R145 R 147 R 148' R 149
321-0046-00
315-0820-00 321-0193-00 323-0161-00 321-0047-00
323-0151-00
321-0115-00 317-0511-00 323-0151-00 315-0223-00 315-0223-00
29 .4 Ω
365 Ω
154 Ω 510 0 365 Ω 22 k Ω 22 k Ω
1/4
VΘ W
'/2
W
W W
W VΘ W '/2 W 1/4 W '/4 W
Prec
1%
5%
Prec Prec Prec
Prec Prec Prec
Prec Prec
Prec
Prec Prec Pr ec
5% 1% 1% 1% 1% 5% 1% 1% 1%
1% 5% 1% 1% 1% 5% 5% 5% 5% 5% 5%
1%
5% 1%
1% 5% 1% 5% 5%
E lect rical
Parts List-71370
TRIGGER Ci rcuit Board Assembly (cont) Ck t. No .
Te ktronix Pa rt No .
Se rial/Model No . Disc
E ff
Description
Resistors (cont) R 150 R l53
154 R 155
317-0560-00 321-0045-00 323-0153-00 321-0045-00 311-0633-00
56 Ω 28 .7 Ω 383 Ω 28 .70 5 kΩ, Var
'/8 W W W W
R156 R158 R 159 R 160 R 163
317-0560-00 315-0562-00 315-0122-00 315-0392-00 317-0392-00
56 Ω 5.6 k Ω 1 .2 42 3.9 42 3.9 k12
'/8 W '/, W '/, W '/, W '/8 W
5% 5% 5% 5% 5%
165 R166 R 167 R 170 R 171
315-0432-00 315-0112-00 315-0562-00 321-0096-00 321-0096-00
4.3 k Ω 1 .1 k Ω 5.6 k Ω 97 .6 Ω 97 .6 Ω
'/, W '/4 W '/, W W W
5% 5% 5% 1% 1%
R173
317-0201-00 315-0100-00 307-0115-00 303-0432-00
Β010100 Β020000
Β019999
5% 5% 5% 5%
Β020000
Β019999
'/θ W '/4 W '/4 W 1 W
307-0115-00
Β010100
200 Ω 10 Ω 7.5 Ω 4.3 k Ω 7.5 Ω
'/4 W
5%
'/θ W '/4 W '/4 W W W '/4 W
R 152
R
R
R 175
R175
R176 R 177 R177
315-0100-00
10 Ω
'/4
Ρ rec
Pr ec Pr ec
Prec Prec
W
5% 1% 1% 1%
5%
R179 R181 R182 R183 R184 R185
317-0201-00 315-0113-00 315-0332-00 321-0222-00 321-0222-00 315-0822-00
200 12 11 k Ω 3.3 k Ω 2 kΩ 2 kΩ 8.2 k Ω
186 187 R188 R190 R190 R 191
311-0978-00 321-0313-00 317-0152-00 317-0103-00 317-0203-00 321-0313-00
250 Ω, V ar 17.8 kΩ 1 .5 k Ω 10 kΩ 20 kΩ 17 .8 k Ω
R192
201 203 R 205 R 209
317-0511-00 315-0152-00 315-0512-00 315-0512-00 315-0104-00 315-0512-00
510 Ω 1 .5 k Ω 5.1 k Ω 5.1 k Ω 100 kΩ 5.1 k Ω
'/θ W '/4 W '/4 W '/4 W '/4 W '/4 W
5% 5% 5% 5% 5% 5%
210 212 R 214 R 215 R 217 R 219
317-0221-00 317-0221-00 315-0155-00 317-0472-00 317-0124-00 315-0392-00
220 Ω 220 Ω 1 .5 ΜΩ 4.7 k Ω 120 kΩ 3.9 k Ω
VΘ W '/8 W '/4 W W ΥΘ W '/4 W
5% 5% 5% 5% 5% 5%
219 221 R 225 R 230 R 231
315-0153-00 317-0162-00 307-0112-00 315-0155-00 317-0472-00
15 kΩ 1 .6 k Ω 4.3 Ω 1 .5 ΜΩ 4.7 k Ω
'/4 W '/θ W '/4 W '/4 W '/θ W
5% 5% 5% 5% 5%
R R
R 193 R R
R R
R R
6-8
Β010100 Β050000
Β010100 Β040000
Β049999
Β039999
W W W W W
Pr ec Prec
Prec
Pr ec
5% 5% 5% 1% 1% 5% 1"/0 50/. 5% 5% 1%
E lectrical Parts Ust-71370
T RIGGER Ci rcuit Board Assembly (cont) Ckt. No .
Te ktronix Part No .
Serial/Model No . Disc
Desc riptio n
E ff
Resisto rs
(cont ) 120 kΩ 3.9 42 15 k Ω 1 .6 kΩ 4.30
'/Θ W 1 /4 W 1/4 W '/8 W 1/4 W
5% 5% 5% 5% 5%
315-0106-00 315-0474-00 315-0623-00 315-0106-00 317-0510-00 321-0268-00
10 ΜΩ 470 kΩ 62 k Ω 10 MO 51 Ω 6.04 k Ω
1/4 '/4 '/4 1/4
5% 5% 5% 5% 5% 10/0
R257
311-0884-00 321-0222-00 321-0260-00 317-0510-00 321-0268-00
100 Ω, Va r 2 kΩ 4.99 k Ω 51 Ω 6.04 k Ω
R258
311-0884-00
100
R 233 R 234 R 234 R 235 R 239 R 241
R 243 R 244 R 246
R 248 R 250 R251
R 252 R253 R255
R259 R260 R 265
R 275 R 282
R284 R284
R300
R301
302
R
R303
317-0124-00 315-0392-00 315-0153-00 317-0162-00 307-0112-00
315-0102-00 315-0513-00 315-0123-00 317-0620-00
13010100
317-0430-00
13100000
317-0620-00
R313 R315 R318 R 319 R 320 R 322 R 324
R 326 R327
R328' R329
Β 029999
Β070000
Β069999
Β099999
W W W W W W
Prec
W W W W
Prec Prec
2 kΩ 4.99 k Ω 1 kΩ 10 k Ω
'/Θ W W W W
Prec Prec
1 kΩ 51 k Ω 12 kΩ 62 Ω
1/4 W 1/4 W 1/4 W W
W
Prec
249 Ω 51 Ω
'/α W '/α W
Prec
0, Va r
432 Ω
321-0135-00 317-0510-00
R 306
R310
13010100 Β030000
321-0158-00
317-0510-00
R307
Β039999
321-0222-00 321-0260-00 317-0102-00 321-0289-00
R 303 R303
13010100 Β040000
51 Ω
12 62 Ω
43
( n ominal
val u e)
(n ominal val u e)
'/Θ W W
Ρ reε
Prec
Selected
Selecte d
Prec
1% 1% 5% 1%
1% 1% 5% 1% 5% 5% 5% 5%
1%
1% 5% 5% 1%
321-0177-00
681 Ω
470 Ω 820 Ω 20 Ω 150 Ω
W 1/4 W ΥΘ W W
317-0752-00 317-0751-00 317-0391-00 317-0301-00 317-0200-00
7.5 42 7500 3900 300 Ω 20 Ω
W W VΘ W W W
5% 5% 5% 5% 5%
317-0242-00 315-0152-00 317-0200-00
2.4 42 1 .5 42 200
1/8 W 1/4 W '/α W
5% 5% 5%
317-0471-00 315-0821-00 317-0200-00 317-0151-00
5% 50/. 5% 5%
6-9
Electrical Paris List7870
TRIGGER Circuit Board Assembly (cont) Ckt. No .
Tektronix Part No .
Se rial/ Model No . Ε# Disc
Description
Resistors (cont) R331 R333 R334 R335 R336
R 339 R340 R341
R342 R 343
R 344 R346 R353 R354
R356
R 357 R 361
R363 R364 R 366
R 367 R370 R 371
R372 R374
R377 R 379 R 380
315-0152-00 317-0102-00 317-0183-00 317-0202-00 317-0102-00
1 .5 k Ω 1 kΩ 18 k Ω 2 kΩ 1 kΩ
W W W W '/Θ W
5% 5% 5% 5% 5%
317-0471-00 317-0102-00 317-0303-00 317-0102-00 315-0154-00
470 Ω 1 kΩ 30 k Ω 1 kΩ 150 k Ω
'/8 W ΥΘ W W W 1/,, W
5% 5% 5% 5% 5%
315-0223-00 315-0302-00 321-0321-00 321-0285-00
22 k Ω 3 42 21 .5 42 9.09 42
'/4 W '/4 W W W
5% 5% 1% 1%
321-0239-00 321-0126-00 317-0036-00 321-0144-00 321-0122-00
3.01 kΩ 200 0 3.6 0 309 12 182 Ω
W W '/Θ W '/Θ W '/Θ W
Pr ec Prec
321-0030-00 323-0192-00 317-0103-00 317-0103-00 317-0101-00
20 Ω 976 Ω 10 k Ω 10 k Ω 100 Ω
'/8 W W W '/Θ W '/Θ W
Pr ec Prec
315-0391-00 315-0182-00 317-0100-00
390 Ω 1 .8 k Ω ion
'/4 W '/4 W '/Θ W
321-0177-00
681 Ω
VΘ W
Prec Pr ec Prec
Prec Prec
1%
1% 1% 5% 1% 1%
1% 1% 5% 5% 5%
5% 5% 5%
Integrated Ci rcuits U 192 U260 U 267 6- 1 0
156-0015-00 156-0049-00 156-0049-00
Oper. Am pl. Ope r. Am pl. Oper. Am pl.
TO-99 R eplaceable by Fai rchil d μΑ741C A741 C R eplaceable by Fai rchil d μ
Electrical
INTERFAC E -Ci rcuit Ckt. No.
Te ktron ix Part No.
Parts Ust--7B70
Board Assembly
Se rial/ Model No . Disc
Description
Eff
Complete Board
*670-1137-00
Capacitors Tole ran ce ±20% un less otherwise indicated. C280 C530 P C530 R
290-0267-00 281-0523-00 281-0536-00
C530S
283-0599-00
C530S
281-0523-00
Β010100
Β060000
Β059999
1 μF 100 p F 1000 pF 100 p F 98 pF
Elect . Ce r Ce r
35V 350 V 500 V
10%
Mica
500 V
5%
Ce r
350 V
Semiconducto r Device, Diodes CR44 C R461 CR531
Replaceable by 1 Ν4152 Replaceable by 1 Ν4152 Replaceable by I N4152
Silico n Silico n Silico n
*152-0185-00 *152-0185-00 *152-0185-00
Resistors R esisto rs R 178 R 197 R 280 R 312 R 347
R460 R461
R530A R 530B
R530C
R530D R 530F
R530H
R 530J
R530K
R530 L
R530M R530N R530P R530R
a re fixed, compositio n, ±10% un less otherwise in dicated . W 1/4 W 1/4 W 1 W V4 W
5% 5% 5% 5% 5%
W 1/4 W W W 1/2 W
5% 5% 1% 1% 1%
301-0100-00 315-0123-00 315-0513-00 303-0392-00 315-0200-00
ion 12 kΩ 51 k Ω 3.9 k Ω 200
1/2
315-0472-00 315-0752-00 323-0568-08 323-0557-08 323-0546-08
4.7 k Ω 7.5 42 8.06 MO 6.19 ΜΩ 4.75 ΜΩ
323-0546-08 323-0767-07 323-0450-07 323-0450-07 323-0774-07
4.75 ΜΩ 1 .425 ΜΩ 475 kΩ 475 kΩ 118.7 k Ω
W W W W W
P rec
1% 1/10% 1/10% 1/10% I110%
323-0354-07 321-0267-00 323-0775-07 315-0330-00 315-0220-00
47.5 kΩ 5.9 kΩ 71 .25 kΩ 33 Ω 22 Ω
'/τ W '/e W '/τ W V4 W 1/4 W
P rec
1/10% 1% 1/10% 5% 5%
V4
Prec Preε Prec
Prec P rec Prec Pr ec
Prec Prec
6-11
Electrical Paris Ust-7B70
B oard Assembly (cont)
I N T ERFAC E Ci rc u it Te k tro n ix Part No.
C kt. No .
Se rial/Mo d el No . Disc
Eff
Descri ption
Resistors (cont) R530S R531 R701 R 702 R 704 R705 R 706
R711
R 712
R 713 R721
R722 R723 R724
R 727 R 728
R729
R741
315-0390-00
39 Ω
315-0154-00 315-0133-00 315-0154-00
150 kΩ 13 kΩ 150 42
311-0959-00
W
5%
1/4 W
5% 5% 5%
1/4 W 1/4 W
37 .4 kΩ 75 k Ω 75 42 150 k Ω 75 k Ω
%W 1/4 W 1/4 W 1/4 W 1/4 W
315-0753-00 315-0154-00 315-0154-00 321-0356-00 321-0335-00
75 kΩ 150 42 150 k Ω 49.9 k Ω 30.1 kΩ
1/4 W '/4 W 1/4 W VΘ W 1/8 W
321-0344-00 315-0154-00 321-0229-00
37.4 42 150 kΩ 2.37 kΩ
%W 1/4 W 1/8 W
Cam
*670-1137-00
*670-1139-00 *670-1139-01 *670-1139-02
Β010100 Β030000 Β 010000
MOD E
Pr ec Prec Prec Prec
1% 5% 5% 5% 5% 5% 5% 5% 1% 1% 1% 5% 1%
B01 0100 Β100000
ΤΙΜΕ /DI V CA L IN
Circ u it Board Assembly
Β029999 Β099999
Bulb
*150-0057-01 *150-0048-01
Prec
Switches
Unwire d
DIS PL AY
DS195 DS195
Var
321-0344-00 315-0753-00 315-0753-00 315-0154-00 315-0753-00
Wi re d or 5530 3 S531 4
10 kΩ,
Β099999
Complete Board Com p lete Board Comp lete Boa rd
I nca n desce n t,
7153AS15, selected Inca n desce n t, #683, selected
Resistors Resistors R 195
R264 R264
a re fixed, com p osition, ±10'/, un less ot h erwise i nd icated. 321-0278-00 321-0385-00 321-0338-00
Β 010100 Β030000
'See Mec h a nical Parts List fo r re p lacem e n t parts. `Furn is h ed as α unit with 5530 .
Β029999
7.68 k Ω 100 kΩ 32.4 k Ω
%W 1/8 W 1/8 W
Prec Prec Pr ec
1% 1% 1%
Electrical DIS PLAY Te k tronix P a r t No .
Ck t . No .
MOD E
Circ u it
B oard
Parts
List-711170
Assembly (cont)
Serial/ M o d el No . E ff Disc
Descri p tio n
Switc h
W ired
or Unwired
*670-1139-00 S195 TIME/ 5 8010100 Β029999 Pu s h b u tto n B AS E -A MPL I F I ER *670-1139-01 51955 TIME/ 8030000 Β 099999 Pu s h b u tto n BASE-AMPLIFIER *670-1139-02 5195 TIME/ 5 8100000 Pu sh b u tto n BASE-AMPLIFIER
B oard
CO U PL I N G Circ u it *670-1146-00 *670-1146-01 *670-1146-02
Β010100 Β030000 Β 100000
Β 029999 Β 099999
Assembly
Complete B oard Com p lete B oar d Complete B oar d
Bulb DS270 DS270
*150-0057-01 *150-0048-01
8010100 Β 100000
Tolera n ce ±20% un less ot h e rwise i n dicated . C270 C270
283-0189-00 283-0026-00
Β010100 Β 030000
I n can d escent, 7153AS15, selected I nca n descent, #683, selected
8099999
Capacitor Β029999
0.1 μ F 0 .2 μ F
Ce r Cer
400 V 25 V
Resistor R esisto r s
a r e fixed , com position, ±10% u nless otherwise i n d icated .
R 271
321-0381-00 321-0325-00
R 271
W i r ed 52705 S270 5 5270 5
Β 010100 Β 030000
8010100 8030000 8100000
MOD E *670-1140-00 *670-1140-01 *670-1146-02
90 .9 k Ω 23.7 kΩ
1/Θ W '/Θ W
Pr ec Pr ec
1% 1%
Switch
or Unwired *670-1146-00 *670-1146-01 *670-1146-02
8029999
Β 010100 Β 030000 Β 100000
8029999 Β099999
Circ u it
Pu s h b u tto n Pu s h b u tton Pu s h b u tton
Board
Β 029999 Β 099999
CO UPL I N G CO UPL I N G CO UPL I N G
Assembly
Com p lete B oard Com p lete B oar d Com p lete B oard
Bu lbs DS274 DS274 DS446 DS446 'See Mec h a n ical
*150-0057-01 *150-0048-01 *150-0057-01 *150-0048-01 Parts
List
8010100 8100000 8010100 8100000
8099999 8099999
I nca n desce n t, I nca n desce n t, I nca n descent, Incan d esce n t,
7153AS15, selected #683, selected 7153AS15, selecte d #683, selected
fo r replace m ent p arts .
6- 1 3
E lectrical Parts List7Β70
MODE Circ u it Te k t ro n ix Part No .
Ck t. No .
Board Assembly (cont)
Serial/ M odel No. Disc
E ff
Description
Resistor Resisto rs
a re fixed , com p osition , ±10% un less ot h erwise i nd icated .
R 273
321-0326-00 321-0305-00
R 273
13010100 Β030000
5273 6
*670-1140-00
B01 0100
S273 'i
*670-1140-02
Β100000
*670-1140-01
Β 030000
TIME *670-1138-00 *670-1138-01
24.3 kΩ 14.7 kΩ
Pr ec Pr ec
%W %W
1% 1%
Switch
W ired or Un wi red 52736
Β029999
Β029999 Β 099999
Pu s hbu tton
MOD E
Pu s h b u tto n
MOD E
Pu s hbu tton
MOD E
BAS E Circuit Board Assembly
BO 10100 Β079999 Β080000
Comp lete B oard Comp lete Board
Ca p acitors Tolerance ±20% unless ot he rwise in dicated . C404 C407 C421 C431 C434
283-0080-00 283-0080-00 283-0080-00 283-0080-00 281-0577-00
0.022 μF 0.022 μ F 0.022 μ F 0.022 μ F 14 pF
Ce r Ce r Ce r Ce r Ce r
25V 25V 25 V 25V 500 V
+80%-20% +80%-20% +80%-20% +80%-20% 5%
C441 C446 C456 C456 C457 C466
283-0080-00 290-0136-00 290-0135-00 290-0136-00 281-0524-00 283-0080-00
0.022 μ F 2.2 μ F 15 μ F 2.2 μ F 150 pF 0.022 μF
E lect. E lect. E lect. Ce r Ce r
Cer
25V 20 V 20 V 20 V 500 V 25V
+80%-20%
C469 C524 C527 C530J C530 K
283-0000-00 281-0524-00 281-0523-00 281-0093-00 283-0126-00
0.001 μ F 150 pF 100 p F 82 p F 5.5-18 pF, Va r
C530 L C530M C532 C535 C536
281-0091-00 281-0657-00 283-0080-00 283-0000-00 290-0136-00
2-8 pF, V a r 13 pF 0.022 μF 0.001 μ F 2.2 μF
'See Mecha n ical Parts
L
Β010100 Β090000
ist fo r rep lace ment parts.
Β089999
Ce r Ce r Ce r Ce r Cer Ce r Ce r Ce r Ce r Elect .
500 V 500 V 350 V 1000 V
500 V 25V 500 V 20 V
+80%-20%
5%
2% +80%-20%
E lectrical
Parts List-71170
TIME BAS E Circuit B oa rd Assembly ( εοηt)
C k t. No .
Te k tro n ix Pa rt No .
Serial/ Model No . Disc
Description
Eff
Capacitors (cont) C545 C551 C556 C561 C580A
290-0136-00 281-0523-00 281-0552-00 290-0136-00 283-0164-00
2.2 μ F 100 pF 25 pF 2.2 μ F 2.2 μ F
C580 B C580D C583 C592 C746
283-0191-00 283-0 -~ 66 -00 283-0080-00 281-0546-00 283-0080-00
0.022 μF 890 pF 0.022 μ F 330 p F 0.022 μ F
C748 C752 C763 C788 C789 C799
283-0080-00 283-0080-00 281-0557-00 283-0164-00 283-0092-00 290-0136-00
C801
290-0420-00
C803 C805 C807 C809
C813 C815 C817 C819 C821
290-0136-00 290-0136-00 290-0136-00 283-0080-00
290-0136-00 290-0136-00 290-0136-00 290-0136-00 290-0420-00
0.022 μ F 0.022 μ F 1 .8 p F 2.2 μ F 0.03 μ F 2.2 μ F
ΧΒ 080000
.
F
0.68 μ
2.2 μ F 2.2 μ F 2.2 μ F 0.022 μ F 2.2 μ F 2.2 μ F 2.2 μ F 2.2 μ F 0 .68 μF
Elect . Ce r Ce r Elect .
20 V 350 V 500 V 25 V 25 V
Cer Cer Cer Ce r
50 V 100 V 25V 500 V 25 V
Cer Cer Ce r Ce r Cer E lect.
25 V 25V 500 V 25 V 200 V 20 V
Cer
M ica
E lect. E lect . E lect. E lect. .
Cer
E lect. E lect. E lect.
Elect.' E lect.
75
-F80%-20%
2% -Ι-80%-20% 10% +80%-20% +80%-200/o +80%-20% ±0 .1 pF -+-80%-20%
V
20V 20 V 20V 25 V
+80%-20%
20 V 20 V 20 V 20 V 75 V
Semicondu ctor Device, Diodes
b y 1 Ν4152
C R 406 CR 412 C R 413 C R 414 C R 419
*152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00
Silicon Silicon Silico n Silico n Silicon
R eplacea b le
C R 427 CR 428 CR 431 CR 436 CR 446
*152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00
Silico n Silico n Silico n Silicon Silicon
R eplaceable by 1 Ν4152 R eplaceable by 1 Ν4152 R eplaceable by 1 Ν4152
C R448
*152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00
Silico n Silicon Silico n Silico n Silicon
Replaceable by l N4152
C R449 CR 451 C R 452 C R 453
eplaceable R e p laceable R e p laceable R e p laceable R
Replaceable Re p laceable
Replaceable
by by by by
1 1 1 1
Ν4152 Ν4152 Ν4152 Ν4152
by 1 Ν4152 by 1 Ν4152
by 1N4152
Re p laceable by 1N4152 Re p laceable by 1N4152 R e p laceable by 1 Ν4152
6- 1 5
Electri cal Parts List7Β70 ' TIME
Ckt.
No .
Te k t r onix P a rt No .
BASE
Boa rd
Circuit
Assembly (cont)
Se rial/Mod el No . Disc
E ff
Desc ri p tio n
Semicond u cto r Device, Dio des ( εοη t)
C R454 CR 459 CR 462
*152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00
Silicon Silico n Silicon Silicon Silico n
R ep laceable R e p laceable R e p laceable R e p laceable R e p laceable
CR 467 CR 468 C R469
*152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00
Silicon Silicon Silico n Silicon Silico n
R e p laceable by I N4152 R e p laceable by 11\14152
C R525 C R 528 CR 529 CR 534 C R548
*152-0185-00 *152-0185-00 152-0246-00 *152-0185-00 152-0141-02
Silicon Silicon Silico n Silicon Silico n
Re p laceable by 1N4152 Re p laceable b y 1 Ν 4152
C R571 C R572
*152-0185-00 *152-0185-00 152-0279-00 *152-0185-00 *152-0185-00
Silico n Silicon Ze n er Silicon Silico n
Replacea b le Re p laceable 1 Ν751 Α R e p laceable R e p lacea b le
by 1N4152 by 1N4152 400 m W, 5.1 V, 5% by 1 Ν 4152 by 1 Ν4152
C R576
*152-0185-00 152-0326-00 *152-0185-00 *152-0185-00 *152-0185-00
Silico n Ze n e r Silicon Silicon Silico n
R e placeable 1 Ν755 Α R e p laceable R e p laceable R e p laceable
by 1 Ν 4152 400 m W, 7 .5 V, 5% by 1 Ν 4152 by 1 Ν 4152 by 1 Ν4152
CR 592 CR 594
*152-0185-00 *152-0185-00 *152-0185-00 *152-0185-00
Silicon Silicon Silicon Silicon
R e p laceable R e p laceable R e p laceable Re p laceable
by by by by
C R463
C R464 CR 465 C R466
VR573 C R574 C R 575
VR 576 CR 580 CR 581 CR 582
CR 597
CR 598
Relay Κ780
A rmat ure, d pdt, 15 V DC
*148-0034-00
In ducto r L 593
*108-0440-00
8 μΗ
by by by by by
I N4152 1N4152 1N4152 I N4152 1N4152
Re p laceable by 1N4152
R eplaceable by I N4152
R e p laceable by I N4152
L ow lea k age 250 mW , 40 V Re p laceable by 1 Ν 4152 1 Ν 4152
1 1 1 1
Ν4152 Ν4152 Ν4152 Ν 4152
E lectrical
Parts List-7B70
TIME BAS E Circuit B oa rd Assembly (cont) C k t. No .
Te ktronix P a rt No .
Se rial/ Model No . Eff Disc
Description
Transistors Q406 Q408 Q410 Q416 Q424
*151-0190-01 *151-0190-01 151-0188-00 *151-0190-01 *151-0190-01
Silicon Silicon Silicon Silico n Silicon
Te k S pec Te k S pec 2Ν3906 Te k S pec Te k Spec
Q432 Q436 Q442 Q446 Q454
151-0188-00 151-0188-00 151-0188-00 151-0207-00 *151-0190-01
Silicon Silicon Silico n Silico n Silicon
2Ν3906 2Ν3906 2Ν3906 2Ν3415 Te k Spec
Q456 Q468 Q524 Q526 Q532
*151-0190-01 *151-0190-01 151-0188-00 *151-0289-00 *151-1036-00
Silicon Silicon Silicon Silicon Silicon
Te k Spec Te k S p ec 2 Ν3906 Te k Spec D u al, FET, Tek
0534 0546 Q554 Q564 Q566
151-0188-00 151-0220-00 *151-0190-01 *151-0190-01 *151-0190-01
Silicon Silicon Silico n Silicon Silico n
2 Ν3906 2N4122 Te k Spec Te k Spec Te k Spec
Q582 0592 Q594 Q752 Q753 Q764
151-0188-00 *151-0190-01 *151-0190-01 *151-0289-00 *151-0190-01 *151-0190-01
Silicon Silico n Silicon Silicon Silicon Silico n
2Ν3906 Te k Spec Te k Spec Te k S pec Te k S pec Te k Spec
Q774 Q784 Q794
*151-0190-01 151-0220-00 151-0220-00
Silico n Silicon Silicon
Te k S p ec 2Ν4122 2Ν4122
ΧΒ080000
S pec
Resistors R esisto rs R404 R406 R407 R408 R409 R410 R 411
R 412 R 416 R 418
are fixed, compositio n , ±10% un less oth erwise i ndicated. 315-0151-00 315-0103-00 315-0151-00 321-0174-00 321-0252-00
150 Ω 10 kΩ 150 Ω 634 Ω 4.12 k Ω
315-0101-00 321-0277-00 315-0153-00 321-0315-00 315-0202-00
100 Ω 7.5 k Ω 15 k Ω 18.7 kΩ 2 kΩ
'/4 W '/4 W '/4 W '/8 W 1/8 W 1/4
W
'/4
W
P rec
Prec
'/e W
Prec
1/8 W '/4 W
Prec
5% 5% 5% 1% 1% 5% 10/. 5% 1% 5% 6- 1 7
E lect rical
Parts List-71370 TIME BAS E Circu it Board Assembly (cont)
Ck t. No .
Te ktronix P art No .
Serial/Model No . Disc
Eff
Description
R esisto rs R419 R421
R422 R
423
R 424
426
R
R427 R428 R 431
R432 R 433 R 434 R 435 R 436 R438
R
441
R444 R448 R449
R451
R452
R454 R 455 R456 R458 R459
462 R464 R465 R 466 R
R 468 R469 R 521
R 523 R 524 R525 R 526 R 527
R 532
R533
534
R
R535
R 536 R 537 R 539
315-0221-00 315-0431-00 315-0112-00 315-0220-00 315-0302-00 315-0132-00 315-0561-00 321-0300-00 315-0470-00 321-0136-00
_
(cont) 220 Ω 430 Ω 1 .1 kΩ 22 Ω 3 kΩ
1/4 '/4 '/4 1/4 1/4
W W W W W
5% 5% 5% 5% 5%
1 .3 k Ω 560 Ω 13 42
'/α W 1/4 W '/Θ W 1/4 W '/Θ W
5% 5% 1% 5% 1%
47 Ω
255 12
W W W W W
Prec Prec
321-0129-00 321-0265-00 321-0244-00 321-0167-00 301-0102-00
215 Ω 5.62 kΩ 3.4 kΩ 536 Ω 1 kΩ
Prec
301-0470-00 315-0102-00 321-0277-00 315-0472-00 315-0223-00
47 Ω 1 kΩ 7.5 kΩ 4 .7 k Ω 22 k Ω
1/2 W 1/4 W '/Θ W 1/4 W 1/4 W
321-0306-00 315-0472-00 315-0682-00 315-0153-00 315-0103-00
15 k Ω 4.7 kΩ 6.8 k Ω 15 kΩ 10 k Ω
'/8 W 1/4 W V4 W '/4 W Υ4 W
315-0123-00 315-0752-00 321-0271-00 321-0234-00 321-0277-00
12 kΩ 7.5 k Ω 6.49 kΩ 2.67 kΩ 7.5 42
1/4 W 1/4 W W W W
321-0306-00 321-0209-00 315-0101-00 321-0266-00 315-0222-00
15 42 1 .47 k Ω 100 Ω 5.76 k Ω 2 .2 42
W W 1/4 W '/Θ W 1/4 W
Prec Ρίeε
321-0289-00 321-0269-00 321-0193-00 315-0122-00 321-0219-00
10 kΩ 6 .19 k Ω 1 kΩ 1 .2 kΩ 1 .87 k Ω
1/8 W VΘ W 1/8 W 1/4 W '/Θ W
Prec Prec Prec
322-0281-00 315-0470-00 315-0220-00 308-0306-00 315-0101-00
8.25 kΩ 47 12 22 0 3.26 42 100 Ω
1/4 W 1/4 W 1/4 W 3W 1/4 W
P rec
P rec
Pr ec Prec
P rec
Pr ec
1 -/0 1 -/0 1% 1% 5% 5% 5% 1% 5% 5% 1% 5%
5%
5% 5%
Prec Prec Prec
Prec
P rec
WW
5% 5% 1% 1% 1% 1% 1% 5% 1% 5% 1 ./0 1% 1 ο/ο 5% 1% 1% 5% 5% 2% 5%
Electrical Parts List7Β70
TIME BAS E Circ uit B oard Assembly (cont) Ckt. No .
Te ktronix Part No .
Serial/Model No . Disc
Description
E ff
Resistors
(cont)
321-0260-00 315-0114-00 321-0231-00 315-0470-00 301-0102-00
4.99 k Ω 110 k Ω 2.49 kΩ 47 Ω 1 kΩ
'/Β W 1/4 W 1/8 W 1/4 W 72 W
R 552
554 R 556
301-0561-00 321-0211-00 321-0231-00 321-0178-00 321-0260-00
560 Ω 1 .54 k Ω 2.49 k Ω 698 Ω 4.99 k Ω
1/2 W W W W '/Β W
557 558 R561 R564 R565
321-0239-00 321-0193-00 315-0820-00 321-0207-00 321-0189-00
3.01 kΩ 1 kΩ 82 kΩ 1 .4 k Ω 909 Ω
1/8 W '/Β W 1/4 W W W
R 566
567 R 568 R573 R580C
315-0101-00 301-0162-00 315-0470-00 321-0295-00 323-0222-00
100 Ω 1 .6 kΩ 47 Ω 11 .5 kΩ 2 kΩ
1/4 W 1/2 W 1/4 W '/Β W '/Ζ W
581 582 R 583 R 592 R 594
315-0223-00 323-0289-00 315-0104-00 315-0101-00 322-0273-00
22 k Ω 10 k Ω 100 k Ω 100 Ω 6.81 kΩ
1/4
596 R 598 R599 R 715 R743
315-0101-00 322-0310-00 322-0297-00 315-0154-00 315-0470-00
100 Ω 16 .5 k Ω 12 .1 kΩ 150 kΩ 47 Ω
1/4 W '/α W 1/4 W 1/4 W 1 /4 W
745 746 R747 R748 R750
315-0220-00 321-0262-01 315-0220-00 321-0373-00 321-0093-00
22 Ω 5.23 k Ω 22 Ω 75 k Ω 90 .9 Ω
1/4 W '/Β W 1/4 W W W
752
321-0219-00 303-0103-00 323-0205-09 303-0302-00 315-0113-00 321-0244-00
1 .87 k Ω 10 k Ω 1 .33 kΩ 3 kΩ 11 k Ω 3.4 kΩ
'/Β W 1 W '/Ζ W 1 W 1/4 W '/Β W
1 .33 kΩ 3.3 k Ω 6.65 kΩ 1 .001 k Ω 7.5 k Ω
'/Β W 1 W '/Ζ W '/Β W 1/4 W
R 542 R 543 R
544
R 545 R 546
R
548
R 551 R
R
R
R
R R
R
R R
R
R755
763 764 R771 R772 R R
R773
774 R781 R782 R783 R
321-0205-00 303-0332-00 323-0272-00 321-0735-07 315-0752-00
ΧΒ 030000
.
W W 1/4 W 1/4 W 1 /4 W 1/2
Pr ec Pr ec
P rec
Prec P rec P rec
P rec
1% 5% 1% 5% 5% 5% 1% 1% 1 0/. 1%
Pr ec
1% 1% 5% 1% 1%
P rec P rec
5% 5% 5% 1 0/0 1 0/.
P rec P rec
P rec P rec
Pr ec Pr ec
Pr ec Prec Prec Prec P rec
Pr ec Prec P rec
Prec
5% 1% 50/. 5% 1% 5% 1% 1% 5% 5% 5% % 5% 1 0/. 1%
72
1 0/0 5% 1% 5% 5% 1% 1% 5% 1% 1/10% 5% 6-19
E lectrical Parts List7Β70
BAS E Ci rcuit Board Assembly (cont)
TIME Te ktronix Pa rt No .
C kt. No .
Se rial/Mo d el No . Eff Disc
Description
Resistors (cont) R784 R785 R786 R 788 R 789
R791
R794 R795
R796 R797 R799 R801
R803 R805 R807
R809 R815 R 817 R819 R821
321-0228-00 311-0597-00 321-0088-09 317-0472-00 317-0103-00
2.32 k Ω 50 Ω, V ar 80 .6 Ω 4.7 kΩ 10 k Ω
W
Prec
1%
W '/8 W '/8 W
Prec
1% 5% 5%
323-0272-00 321-0235-00 311-0541-00 321-0289-00 321-0289-00
6.65 k0 2.74 kΩ 20 k Ω, Vαr 10 k Ω 10 k Ω
'/2 W W
Ρ reε
Prec
1% 1%
W W
Prec Prec
1% 1%
315-0101-00 315-0510-00 315-0470-00 315-0470-00 315-0101-00
100 Ω 510 47 Ω 47 Ω 100 0
'/4 W '/4 W '/4 W '/4 W '/4 W
5% 5% 5% 5% 5%
315-0101-00 315-0470-00 315-0910-00 315-0101-00 315-0510-00
100 Ω 47 Ω 91 Ω loon 51 Ω
'/4 '/4 '/4 '/4 '/4
W W W W W
5% 5% 5% 5% 5%
SO UR CE Ci rcuit *670-1145-00 *670-1145-01
Β010100 Β 100000
Board Assembly
Β099999
Complete Boar d Complete Boar d
Bu lb DS280 DS280
*150-0057-01 *150-0048-01
B01 0100
*670-1145-00 *670-1145-01
'See Mechan i cal Parts
L ist
I nca ndescent,
7153AS15, selected Incandescent, #683, selected
Switch
Wired or Unwired S2807 S280 7
Β099999
13100000
B01 0100 13 100000
fo r replacement parts.
Β099999
Pu shbutton Pu shbutton
SO UR CE SO UR CE
E lectr ical Parts
MAGNI FI ER Te k tro n ix P a r t No.
Ck t. No.
*670-1107-00 *670-1107-01
Circuit Board Assembly
Serial/ Mod el No. Disc
E ff
13010100 13 100000
List-711370
Desc r i p tio n
Β099999
Complete B oard Com p lete B oard
Bu lb DS780
*150-0057-01
DS780
*150-0048-01
B01 0100 13100000
Β099999
Incandesce nt, 7153AS15, selected
Inca nd escent, #683, selecte d
Switch Wire d or Un wire d S780 8 S780R
"See
Mecha n ical Parts
*670-1107-00 *670-1107-01
L ist fo r replace ment
13010100 Β100000
Β099999
Pu shbu tto n Pu s h b u tton
M AG N I F I ER AG N I F I ER
M
parts . 6-21
SECTIO N 7 DIAG RAMS and MEC HA NICAL PARTS I LLUST RATIO NS
ο
T he following special symbols are
u sed on the diagrams:
Screwdriver ad justme nt Front or rear-panel control or connector . R efers
to the ind icate d diagram .
~~Connection soldered to circuit board. -4B l ue line encloses components located on circuit board. Test
p oint.
VOLTAGE AND WAVEFO RM T E ST CO N DITIONS Typical voltage measurements were obtained d iagrams.
u nder the following cond itions unless n oted otherwise on t he ind ividu al 7704
Vertical M od e H orizontal M od e A Intensity
Level/Slope Trigge ring M ode Coupli ng Source Magnifier Time/Div Variable Time/Div Β Delay M ode P osition Polarity Ban dwidth Volts/Div Coupli ng Position
713711 (Α Horiz Plug-in)
7Α16 ( Left V ertical Plug-in)
LEVEL/S LOPE TR IGGER ING M OD E CO UPLING I
+ UP 20 MHz 1 V AC Centered Centered on positive slope Ρ-Ρ AUTO AC
UR E N F ER
SO AG
Centered on positive slope Ρ-Ρ Auto AC Ext Χ1 1 ms Cal In Ind ependen t Ce ntered
71370
M
Left Α Optimum
C
ΕΧΤ
I
Χ1
1 ms CA L IN TIME BAS E Centered Fully countercloc kwise
ΤΙΜΕ /DIV VAR IA BLE ΤΙΜΕ /DIV DISPLAY M OD E POSITIO N A MPLIFI ER VAR IA BLE
The following control settings and co nnections were changed to obtain waveform ph otogra ph s. 713711 As s hown on waveforms
Time/Div 7 Α 16
Volts/Div Signal inp ut : Α o ne volt, one k ilohertz sine-wave applied to
As shown on waveforms
b oth t he 71370 an d 71371 ΕΧΤ TR IG IN connector.
All voltages give n on the d iagrams are in volts. Voltages ta ken using α Fai rchild M odel 7050 non-loading digital multimeter. Waveforms show n are actual waveform ph otographs ta ken with α Te ktronix Oscillosco pe Camera System and Projecte d Graticule . Voltages an d waveforms on th e d iagrams (shown in b lu e) are not absolute and may va ry b etween instruments because of differing component tolera nces, inte rnal calibr atio n or front panel co ntrol settings . R eadouts are simulated in larger-t han-normal type .
F IGURE A ND INDEX NUMBERS Items i n th is section a r e r efe r enced b y fig u re a n d i nd ex n u mbe r s to th e ill u st r atio n s w h ic h eit her on th e bac k of t h e d iag rams or on pu llo u t p ages imme d iately following the diag r ams of th e i nst ru ction ma nu al .
a pp ea r
I NDENTATION
SYSTEM
T h is mec h a n ical parts list is ind ented to indicate item relatio n s h i p s . exam p le of t h e i n d e n tatio n system u sed i n t h e Desc r i p tio n col u m n .
Followi n g is an
Assem b ly a nd /or Com p on e n t Detail Par t of Assembly an d/or Comp o n en t moun tin g h ardwa r e for Detail P art P arts of Detail Part mo un tin g h ardware for P a r ts of Detail P a r t mo un ting ha rd ware fo r Assembly and /o r Com pon en t
Mo un ting h a rdware always a pp ea rs in t h e same in d en tatio n as th e item it mo unts, w h ile th e d etail p a rts are ind ented to th e r ig h t . I nde n ted items are pa r t of, a nd i n cl u ded wit h , t h e next h ig h er in d entatio n . Mo un ting h a rdwar e
must be
p urchase d
se p a r ately,
u nless
oth erwise sp ecifie d .
PARTS ORDERING INFORMATION R e p laceme n t pa r ts a re availa b le f rom o r thro u g h yo u r local Te ktro n ix, I n c . F ield Office o r r ep rese n tative .
C h anges to Te ktro n ix inst ru me n ts a re sometimes made to accommo d ate im p roved com p o n ents as t h ey become available, an d to give you th e be n efit of t h e latest circ u it imp rovements d evelo p ed i n o u r e n gi n ee ri n g de pa r tme n t . It is t h e r efo r e im p orta nt, w h e n o rde r i n g pa rts, to i n cl u d e t h e followi n g i nformation in yo u r order: P a r t nu m b e r, i n st rument ty p e or nu m b e r, se rial o r model n u m b e r , a nd modificatio n nu m b e r if a p p lica b le . If α p art you h ave o rd ered h as b ee n re p laced with α n ew o r im p rove d part, yo ur local Tekt ro n ix, I n c . Field Office or r e prese ntative will co n tact you co n cern i n g any c h ange i n p a rt nu mber. C h a n ge i n fo r mation, if any, is located at t he rear of t h is man u al .
ABBREVIATIONS
AND SYMBOLS
Fo r an ex p la n atio n of th e abb reviatio n s and sym b ols u sed in t h is section , p lease r efer to t h e page immediately p r eceding t h e E lect rical Pa rts L ist in th is i n stru ction ma nual .
INDEX OF MECHANICAL PARTS ILLUSTRATIONS Title
Location (reverse side of)
Figure 1 Exploded . . . . . . . . . . . . . . . . . . . . . . . . . . . . Horizontal Preamp Diagram
Figure 2 Repackaging . . . . . . . . . . . . . . Decoupling & Output Connector Diagram
7Β70
S E CTIO N
8 ME CH AN ICAL PAR TS L IST F IG URE Fig &
In d ex No . 1-1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12
Serial/ M o d el No . Disc Eff
1
EXPL ODED
t γ
ι z s α s
366-1064-00 - - - - - 213-0153-00 354-0342-00 - - - - - - - - - - 214-1235-00 - - - - - 210-0978-00 210-0590-00
1 1 1 1 1 1 1
KNOB, gray- LEVEL /S LO PE kn ob incl u des : S ETSC REW , 5-40x0 .125 i n c h , H SS R I N G, k nob s k i r t RE SISTO R , va r iable resisto r incl u d es: D R I VE, t u rns re d u ction mo un ti n g h ar d ware : ( n ot incl u ded ω / r esistor) W AS HER, flat, 0 .375 ID χ 0 .50 i n c h OD NU T, h ex ., .312 .375-32x0 i n c h 0
366-1174-00 - - - - - 213-0153-00 366-1173-00 - - - - - 213-0140-00 - - - - - - - - - - 210-0465-00 210-0583-00
1 1 1 1 1 1 1
KNOB, g ray- POSITIO N kn ob incl u d es : SETSC REW , 5-40x0 .125 i n c h , H SS KNOB, gray-F I NE kn ob incl u des : .094 i n c h , H SS SE TSC REW , 2-56x0 RE SISTO R, va r iable mo u nti n g h ard wa re : (not i n cl u d ed ω / resistor) .25-32x0 i n c h 0 NU T, h ex ., .375 .25-32x0 inc h 0 NU T, h ex ., .312
- - - - - - - - - - 220-0420-00
1 1
RESISTO R , variable mo u nting h ardwa re : (not i n cl u d ed ω / resistor) NUT, a d apte r, 0 .50 inc h h ex.
1 1 1 1
ASS EMBL Y, circ u it b oar d-DIS PL AY M OD E ASS EMBLY, circ u it b oar d-DIS PL AY M OD E ci rc u it board assembly i n cl u des : H O U SI N G, lig h t mo un ting h a rdware : ( n ot i n cl u ded ω / h o u si n g) SC REW, t hrea d formi n g, #2x0 .375 i n c h , PH S
Te k tronix Part No .
B01 0100 Β 030000
-13
670-1139-00 670-1139-01 - - - - - 380-0153-00 - - - - - 213-0181-00
-14
131-0589-00 - - - - - 211-0156-00
7 1
T ERM I N A L, pin, 0 .50 inc h lo ng mo un ti n g h ard wa re : (not i n cl u ded ω /ci r c u it boa r d assembly) .25 i n c h , 82° cs k, FH S SC REW, 1-72x0
-15 -16 -17 -18
352-0157-00 378-0602-00 200-0935-00 670-1140-00 670-1140-01 - - - - - 380-0156-01 - - - - - 213-0181-01
1 1 1 1 1 1 1
H O L D ER,
-19 -20
136-0263-03 131-0608-00
Β 010100 Β030000
Β029999
Descri p tion
Β 029999
20 18
lam p LEN S, lamp CA P, lam p h ol d er ASS EMBL Y, circ u it board -MOD E (Triggering) ASS EMBL Y, ci rc u it board -M OD E (Trigge ri n g) circ u it boa rd assem b ly incl u des : H O U SI N G, lig h t mo un ting h a rdware : (not i n cl u ded ω / h o u si n g) SC REW, t hread fo rmi n g, #2x0 .375 i nc h , PH S SOC KET, p i n terminal T ERM I N A L, pi n , 0.365 i n c h long
Mechanical Pa rts
L ist-71370
FIG URE 1 EXPL OD E D (co n t) F ig . & nd ex Te k tronix No . Part No .
I
Q
t γ
ι z s α s
386-1635-00 - - - - - 211-0156-00
2 2
S UPPO RT, ci rc u it boa rd , for 0 .118 i nc h boa r d h eig ht mo un ting h ardwa r e : ( n ot i n cl uded ω /ci rc u it boa rd assembly) .25 inc h , 82° cs k , FH S SC REW, 1-72x0
670-1146-00 - - - - - 386-1557-00 380-0155-00 - - - - - 213-0181-00
1 2 1 1
CI R C U IT B OA R D ASS EMBLY-CO UPL I N G (T r iggering) circ u it b oa rd assembly incl ud es : S UPP O R T, ci r c u it boa r d, fo r 0 .47 i n c h boa rd h eig h t H O U SI N G, lig h t mo un ti n g h ard wa re : ( not incl ud ed ω / h o u sing) .375 inc h , PH S SC REW, t h read formi n g, #2x0
131-0608-00 136-0327-00 131-0590-00 - - - - - 211-0156-00
4 13 85 2
670-1145-00 - - - - - 386-1559-00 380-0155-00 - - - - - 213-0181-00
1 2 1 1
136-0327-00 - - - - - 211-0156-00
10 2
-33
670-1107-00 - - - - - 380-0148-00 - - - - - 213-0181-00
1 1 1
CI R C U IT B OA R D ASS EMBL Y-M AG N I F I ER circ u it board assembly i n cl u des : HO U SI N G, lig h t mo un ti n g hardware : ( n ot i n cl u de d ω / h o u si n g) .375 inc h , PH S SC REW, t h read fo r ming, #2x0
-34
131-0589-00 - - - - - 211-0156-00
6 1
T ERM I N A L, pi n , 0.50 inc h lo n g mo un ti n g hardware : ( n ot i ncl u ded ω /ci r c u it boa r d assembly) .25 i n c h , 82° cs k , FH S SC REW, 1-72x0
366-1189-00 - - - - - -
1 1 1 1 1
KNOB, g r ay-V A R IA BLE kn o b incl udes : S E TSC REW , 5-40x0 .125 inc h, H SS RE SISTO R, va r iable mo un ting h a rdware : ( not i n cl u de d ω / resisto r) S P AC ER, loc ki n g .25-32x0 i n c h 0 NU T, h ex., .312
1-21 -22 -23 -24
-25 -26 -27 -28 -29 -30
-31 -32
-35 -36 -37 -38
213-0153-00 - - - - - - - - - - 361-0143-00 210-0583-00
Serial/ M odel No . E ff Disc
Desc r i ption
T ERM I N A L, p in, 0 .365 i n c h long SOC KET, p i n termi n al T ERM I N A L, pi n , 0 .71 i n c h long mo un ti n g h ard ware : ( n ot i n cl u d ed ω /ci r c u it board assembly) .25 i n c h , 82° cs k , FH S SC REW, 1-72x0 CI R C U IT BOA R D ASS EMBLY-SO UR C E (Triggering) ci r c u it boar d assembly i n cl ud es : S UPPO RT, circ u it board, for 0 .28 i n ch board h eig h t H O U SI N G, lig ht mou nti n g h ard ware : ( n ot i n cl u d ed ω / h o u sing) .375 i n c h , PH S SC REW, thr ea d formi n g, #2x0 SOC KET, pi n te r minal mo unting h a rdware : ( n ot i n cl u ded ω /circ u it boa rd assembly) .25 inc h , 82° cs k , FH S SC REW, 1-72x0
Mechanical Parts List-71370
FIG URE 1 EXPL OD ED (cont) Fig . & I n dex Tektronix No . Part No .
Q t γ
ι z 3 4 5
- - - - - - - - - - 210-0046-00 129-0252-00 358-0409-00
1 2 1 1
RESISTO R, va r iable mounting h a rd ware : (not incl ud ed ω / resistor) WAS HER, loc k, i n ternal, 0 .261 1D χ 0 .40 i n c h OD POST, metallic, .312 .45x0 h ex ., 0.25-32 thread t hru 0 BU S H I N G, mac h ine t hread
-57 -58 -59
358-0301-02 131-0352-02 366-1103-00 - - - - - 213-0020-00 366-1166-00 - - - - - 213-0153-00 384-0490-00 670-1137-00 - - - - - 388-1421-00 105-0122-00 401-0056-00 401-0057-00 407-0653-00 354-0219-00 214-1127-00 214-1139-001 214-1139-02 1 214-1139-03 1 210-0591-00 211-0116-00 200-09 :3-00 - - - - - 210-0001-00 211-0079-00 210-0405-00
1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 6 6 1 4 4 4
BU S H I N G, sleeve, front pa n el t r im CO NNE CTO R , coaxial, 1 contact, BN C, female, ω / ha rdwa re KNOB, gray-ΤΙΜΕ /DI V knob incl ud es : S E TSC REW, 6-32x0 .125 i nc h , H SS KNOB, red -VA R IA BLE (CA L IN) k nob i n cl u des : S ETSC REW, 5-40x0.125 inch , H SS S H A FT, extensio n, 5 .93 inc hes lo ng CI R C U IT B OA R D ASS EMBL Y-I N TERFAC E ci rc u it boa rd assembly i n cl u d es : CI RC U IT B OA RD D RUM, cam switc h -Τ 1 ΜΕ /DI V BEA R I N G, rear BEA R I N G, f r o nt BR AC KET, supp ort R I N G, r etainer R O LLER, detent SPR I N G, flat, gold S PR I N G, flat, g r ee n S PR I N G, flat, r ed NU T, h ex ., 4-40x0 .188 inc h SC REW, sems, 4-40x0 .312 i n c h, ΡΗΒ CO VER, cam switc h mo u nting h a rd wa re : ( n ot incl u ded ω /cove r) WAS HER, loc k , i n ter nal, #2 SC REW, 2-56x0.188 inc h , PH S NU T, h ex ., 2-56x0 .188 i n c h
-60
351-0180-00
1
-62
131-0566-00
26
-63
131-0593-00
-64
84
-65
131-0590-00 131-0608-00
-66
131-0665-00
1
1-39 -40 -41 -42 -43 -44 -45 -46 -47 -48 -49 -50 -51 -52 -53 -54
-55 -56
-61
-67 -68 -69 -70 -71 -72
214-1136-00
351-0155-00 351-0185-00 351-0183-00 - - - - - 220-0547-01 211-0116-00 211-0105-00
Serial/ M od el No . Disc E ff
1. 9 12
12 4 6 5 5 5
Descri ption
G U ID E , act u ator S L ID E , actu ato r
L I NK, termi nal co nnecto r TERM I N A L, T ERM I N A L,
pi n ,
1 .15 i n c h es
lo ng
p in,
0 .67 inc h lo n g
p i n,
0 .88
T ERM I N A L, pi n , 0 .365 i nc h long T ERM I N A L,
i n ch long
G U ID E , te r mi nal lea d G U ID E - P OST, loc k G U ID E - P OST, loc k mo unti n g ha rd wa re : ( n ot incl u ded ω /ci rc u it boa rd assembly) NU T BLOC K .312 i n c h , ΡΗΒ SC REW, sems, 4-40x0 SC REW, 4-40x0 .188 i n c h , 100° cs k , FH S
' R ep lace only with part bearing t h e same colo r co de as t h e o rigi n al part in your
instru ment .
Mec h anical Parts
List-71370
F IG URE 1 EX PL OD ED (co n t ) Fig . & Index No . 1-73 -74 -75 -76 -77 -78 -79 -80 -81 -82 -83 -84 -85 -86 -87
-88 -89 -90 -91 -92 -93 -94 -95 -96 -97 -98 -99 -100 -101 -102 -103 -104 -105 -106 -107 -108 -109 -110 -111
Te k tro n ix Part No .
Serial/ M od el No . Eff Disc
Q t γ
1 2 3 α 5
Desc r i p tion
348-0067-00 670-1138-00 - - - - - 388-1422-00 214-0579-00 135-0337-00 136-0220-00 136-0235-00 136-0263-03 131-0608-00 200-0945-00 200-0945-01 211-0062-00 211-0155-00 361-0238-00
1 1 1 22 1 27 1 41 4 1 1 1 5 5
G RO MMET, p lastic, 0 .312 inch d iameter CI R C U IT B OA R D ASSEMBLY-TIME B ASE circ u it boa rd assembly i n cl u d es : CI RC U IT B OA RD PIN, test point SOCKET, relay, 8 p in SOCKET, tra nsisto r, 3 p i n , s qu are SOCKET, tra n sistor, 6 p i n SOCKET, p i n terminal TERM I N A L, p i n , 0.365 i n c h long CO VER, h alf, transisto r , tem p sta b ilize r , d u al CO VER, h alf, tra nsisto r , temp stabilize r , d u al t hreaded .312 inch , RH S SC REW, 2-56x0 SC REW, 4-40x0 .081 i n ch , k n u rle d S PAC ER , sleeve
388-1431-00 388-1639-00 670-1136-00 670-1136-01 670-1136-02 - - - - - 388-1420-00 200-0945-00 200-0945-01 136-0220-00 136-0337-00 136-0237-00 136-0263-03 13 :-0350-00 214-0579-00 211-0155-00 361-0238-00 214-1140-00 131-0937-00 348-0235-00 670-1144-00 - - - - - 388-1428-00 337-1270-00 131-0608-00 136-0252-01 136-0336-00 136-0337-00 136-0350-00 200-0945-00 200-0945-01 211-0062-00 - - - - - 131-0907-00 407-0748-00 344-0131-00 211-0116-00 210-0406-00
1 1 1 1 1 1 2 2 9 3 3 29 33 11 5 5 10 2 2 1 1 1 6 6 1 1 1 1 1 1 1 1 1 2 1
CI R C U IT B OA R D, s h iel d (T rigge ring) CI R C U IT B OA R D, s h iel d (TIME B AS E, not s how n) ASS EMBL Y, ci rc u it board -T R IGG ER ASS EMBL Y, ci rc u it boa rd -T R IGG ER ASS EMBL Y, ci rc u it board-T R IGG ER circ u it board assembly incl ud es : CI R C U IT BOA R D CO VER, h alf, transisto r , tem p stabilizer, d u al COVER, h alf, transisto r, tem p stabilizer, d u al, t hreade d SOCKET, transisto r, 3 p in, s q u are SOCKET, relay, 8 p i n SOC KET, transistor, 8 p i n SOCKET, p i n te rminal SOC KET, tra n sistor, 3 p i n PIN, test point SC REW, 4-40x0 .081 inc h , knur le d S P AC ER , sleeve S PR I N G, h elical com p ressio n T ERM I N A L, l u g ( n ot sh ow n ) S H I EL DI N G GAS KE T CI R C U IT B OA R D ASS EMBLY- EXT ERN A L I NPU T ci r c u it boar d assembly i n cl u des : CI R C U IT BOA R D S H I EL D T ERM I N A L, p i n , 0 .365 i n c h lo n g SOC KET, p i n connector SOC KET, r elay, 5 p i n SOC KET, r elay, 8 p i n SOC KET, transisto r CO VER, h alf, tra n sistor, tem p stabilizer, d u al CO VER, half, tr a nsistor, tem p stabilize r , d u al t hrea d ed .312 i n c h , RH S SC REW, 2-56x0 mo u nting h ar d ware : (n ot i n cl ud ed ω /circu it board assembly) CO NTACT, elect r ical g r o un d BRAC KET C L I P , ci r c u it boa rd .312 i nc h , ΡΗΒ SC REW, sems, 4-40x0 NU T, h ex., 4-40x0 .188 i n c h
B01 0100 Β020000 Β030000 ΧΒ040000 ΧΒ 040000
B01 9999 Β 029999
M F IG URE F ig . & I
n d ex No .
Te k tronix Part No .
Serial/ M odel No . Disc Eff
E X PLOD E D
1
Q t γ
ec h anical
Parts
List-71370
(cont)
Desc r iption
ι z 3 α s
352-0213-00 386-1657-00 131-0664-00 - - - - - -115 211-0101-00 210-0586-00
1 9 1 1 1
H O L D ER, ca b le S UPP O R T, ci r c u it board, for 0 .185 inc h board h eig h t CO N TACT, elect r ical, s haft g ro un d mo un ti n g h a r d wa r e : (not incl u d ed ω /co ntact) SC REW, 4-40x0 .25 inc h , 100° cs k , F H S .25 i n c h NU T, ke p s, 4-40x0
-116 -117 -118 -119 -120 -121 -122 -123 -124 -125 -126 -127 -128
366-1058-01 214-1095-00 105-0076-00 214-1280-00 105-0075-00 214-1054-00 333-1260-00 386-1447-13 386-1402-00 214-1061-00 426-0505-04 426-0499-04 213-0192-00 361-0326-00 337-1064-00 214-1190-00 407-0553-00 361-0326-00 - - - - - - - - - - 210-0583-00
1 1 1 1 1 1 1 1 1 1 1 1 8 1 2 1 1 1 1 1
KNOB, latc h PIN, s pri n g s p lit RELE AS E BA R, latc h S PR I N G, h elical extension BODY, latc h S PR I N G, flat, latch d ete n t PANEL, fro n t SUBP A NEL, f r o n t P A NEL, rear SPR I N G, flat, sliding, gro un d FRAME S E CTIO N , to p FR A ME S ECTIO N , bottom SC REW, thr ea d fo r ming, 6-20x0 .50 inc h , Fil H S S P AC ER , sleeve, 0 .10 i n c h lo n g S H I EL D, electr ical E XT EN D ER - RET R ACTO R , k nob BR AC KET, va riable resistor S P AC ER , sleeve, 0 .10 i n c h long RE SISTO R , variable mo u nti n g h a rd ware : ( n ot i n cl u ded ω / r esisto r ) .25-32x0 i n c h 0 NU T, h ex ., .312
-134
344-0189-00 - - - - - 211-0601-00 -135 210-0407-00
2 1 1
C L I P, ca p acito r mo un ti n g h ar d wa d e fo r eac h : ( not i n cl u de d ω /cli p ) SC REW, sems, 6-32x0 .312 inc h , ΡΗΒ .25 inc h NU T, h ex ., 6-32x0
-136 -137 -138 -139 -140 -141 -142 -143 -144 -145 -146 -147
ft ft ft ft ft 6 3 2 2 1 1 43 1 6 6
1-112 -113 -114
-129 -130 -131 -132 -133
175-0825-00 175-0827-00 175-0828-00 175-0829-00 175-0831-00 352-0171-00 352-0169-00 352-0162-00 352-0163-00 352-0164-00 352-0166-00 131-0707-00 131-0708-00 131-0755-00 -148 131-0512-00
WI RE, electrical, 2 wire ribbo n , 6 .25 inc h es lo ng WI RE, electrical, 4 wi re r i bb on, 11 .50 inch es long WI RE, electr ical, 5 wire r ib b o n, 2 .50 i n c hes long WI RE, electrical, 6 wi re ribbon, 5 inc h es lo n g WI RE, electrical, 8 wi re ribbon, 4 i n c h es lo n g H O L D ER, termi n al co nn ector, 1 wire H O L D ER, te rmi n al con n ector, 2 wire H O L D ER, terminal co n nector, 4 wi r e H O L D ER, terminal co n necto r , 5 wi re H O L D ER, te r minal co nn ector, 6 wire H O L D ER, terminal con n ecto r , 8 wire CO NNE CTO R , CO NNE CTO R, CO NNE CTO R , CO NNE CTO R ,
terminal, te rminal, te r mi n al, termi n al,
(fo r la r ge wire) (fo r small wi r e) (for small wi re) coaxial cable
STA N DA R D ACC E SSO R I E S 070-0982-00
2
M A NU A L,
i n stru ction (not s h ow n)
8-5
MANU AL
C HANGE
I NFORM ATIO N
At Te k tro nix, we conti nu ally strive to kee p up with latest electron ic d evelopme nts by add ing ci rcuit and component improvements to our i nstruments as soon as they are d eveloped and tested . Sometimes, due to printing and sh ip p ing req uirements, we ca n't get these changes immediately into pr inted manuals. H ence, your ma nu al may contain new change info rmation on following p ages . Α si ngle change may affect several sectio ns. Sectio n s of the ma nu al are ofte n p rinted at d ifferent times, so some of the information on the change pages may al r eady b e in yo ur manual . Si n ce the change info rmation sheets ar e ca rried in the ma nu al un til ALL ch anges are p erma nently ente red, some d up lication may occur. If no such chan ge pages appea r i n this section, yo ur manual is co rrect as pr inted .
7Β70
TEXT CORRECTI ON
Performance
Section 5 Page 5-8
Chec k/Ca libration
12ε line 1
CHANGE TO READ : ε. Page 5-8
Connect α 200 Hz sine wave from the l ow- frequency
Table
5-1
CHANGE TO READ : TABLE 5-1
7Β70 COUPLING
_
__
S ine -Wave Ge nerator . litude
AC
ΙΝΤ
200 Hz
0 .5 div
AC HF REJ
ΙΝΤ
200 Hz
0 .5 dίν
ΙΝΤ
200 Hz
0.5 div
DC
A C IF REJ
ΙΝΤ
30 kHz
0.5 dίν
AC HF REJ
ΙΝΤ
50 kHz
0 .5 div
AC
ΕΧΤ
200 Hz
125 mV
ΕΧΤ
200 Hz
125 mV
DC
ΕΧΤ
200 Hz
125 mV
A C IF REJ
ΕΧΤ
30 kHz
125 mV
ΕΧΤ
50 kHz
125
AC
HF REJ
AC HF REJ
mV
~
7870
ELECTRICAL PARTS LIST AND SC HEMATIC OORRECTΙOΝ TRIGGER
Ci r cuit
B oard Assemb ly
CHANGE TO : R303
317-0430-00
43 *n
(nomina l va lue)
Selected
817,239/171/Rev .
7B70
TENT SN B120000-up ELECTRICAL PARTS LIST AND SCHEΜATIC CORRECTION
C ircuit Board Asse mbly
INTERFACE
CHANGE TO : Complete B oard
670-1137-01 ADD :
CR702
152-0185-00
Silicon
'-' ο
Rep laceab le b y 1Ν4152
C AL
R-702.
~ C R 702
ΤΙΜ Ι IV~G ~ W:ITC Η
3
) -B32
Μ17,382/571
