Instruction Manual
'Tektronix DC 504A Counter/Timer 070-4291-00
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Instruction Manual
Tektronix i
DC 504A Counter/Timer 070-4291-00
Warning The servicing instructions are for useby qualified personnel only. To avoid personal injury, do not perform any servicing unless you arequalified to do so . Refer to the Safety Summary prior to performing service. Please check for change information at therear of this manual. First Edition: January 1983 Last Revised: June 1988
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product . In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid . Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations . This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product ; b) to repair damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product.
~a ._ ~ _d ~ _ ;,a _a
._ ~ _n ~a l _ca ~ _n ~
_c~
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED . TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE . TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND TTS VENDORS WII,L NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILTTY OF SUCH DAMAGES .
TABLE OF CONTENTS List of Illustrations. . . . . . . . - . . . . . . . . . . . . ' . . . . . List of Tables Operators Safety Summary . . . . . . . . . . . . . . . . . . . Servicing Safety Summary . . . . . . . . . . . . . . . . . . .
E
Section 1
Section 2
0
SPECIFICATION Instrument Description . Standard Accessories . Performance Conditions . Electrical Characteristics Environmental . . . . . . . . Physical Characteristics
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iii iii iv v
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1-1 1-1 1-1 1-2 1-6 1-7
wA R N I KG THE FOLLOWING SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONL Y. TO AVOID PERSONAL INJURY, DO NOTPERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. REFER TO OPERATORS SAFETY SUMMARY AND SERVICE SAFETY SUMMARY PRIOR TO PERFORMING ANY SERVICE.
OPERATING INSTRUCTIONS Introduction . . . . . . . . . . . . . . . . . . . . Preparation For Use . . . . . . . . . . . . . First Time Inspection . . . . . : . . . . Operating And Non-Operating Environments . . . . . . . . . . . . . . . . Rear Intertace Considerations . . . Installation And Removal . . . . . . . . . Controls And Connectors . . . . . . . . . Operating Considerations . . . . . . . . . Input Connections . . . . . . . . . . . . . . . Maximum Safe Input Voltage Limits Connecting External Signal Sources Input Coupling, Noise, And Attenuation . . . . . . . . . . . . . . Triggering . . . . . . . . . . . . . . . . . . . Input Coupling Switch . . . . . . . Trigger Level . . . . . . . . . . . . . . Reducing Measurement Errors . . . Frequency Measurements . . . . . . . . . Measurement Intervals . . . . . . . . . Overflow . . . . . . . . . . . . . . . . . . . . Frequencies Lower Than 10 MHz Frequencies Higher Than 10 MHz Period Measurements . . . . . . . . . . . . Low Frequencies . . . . . . . . . . . . . Period Averaging . . . . . . . . . . _ . . Width Measurements . . . . . . . . . . . . Width Averaging . . . . . . . . . . . . . . Totalizing . . . . . . . . . . . . . . . . . . . . . . Starting The Count . . . . . . . . . . . . Repackaging For Shipment . . . . . . . .
2-1 2-1 2-1
Page Section 3
Introduction . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . Input Conditioning . . . . . . . . . Signal Routing . . . . . . . . . . . . Direct . . . . . . . . . . . . . . . . Prescaler . . . . . . . . . . . . . . X100 Multiplier . . . . . . . . Counter . . . . . . . . . . . . . . . . . Function, Range, And Decimal Function Select . . . . . . . . . Range Select . . . . . . . . . . Decimal Point Logic . . . . . Autorange . . . . . . . . . . . . . . . Display . . . . . . . . . . . . . . . . . . Power Supplies . . . . . . . . . . .
2-1 2-1 2-1 2-2 2-5 2-5 2-5 2-5 2-5 2-6 2-6 2-6 2-6 2-6 2-6 2-6 2-7 2-7 2-8 2-8 2-8 2-8 2-8 2-9 2-9 2-9
THEORY OF OPERATION
Section 4
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3-1 3-1 3-1 3-1 3-1 3-1 3-1 3-2 3-4 3-4 3-4 3-4 3-5 3-6 3-6
CHECKS ANO ADJUSTMENTS Performance Check Procedure Introduction . . . . . . . . . . . . . Adjustment Interval . . . . . . Services Available . . . . . . . . Test Equipment Required . . Adjustment Procedure . . . . . . . Introduction . . . . . . . . . . . . . Test Equipment Required . . Preparation . . . . . . . . . . . . .
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4-1 4-1 4-1 4-1 4-1 4-7 4-7 47 4-7
DC 504A
TABLE OF CONTENTS (cont) Section 5
MAINTENANCE Static Sensitive Components . . . . . . Test Equipment . . . . . . . . . . . . . . . - . Cleaning Instructions . . . . . . . . . . . . . Exterior . . . . . . . . . . . . . . . . . . . - Interior . . . . . . . . . . . - . . . . . . . - Obtaining Replacement Parts . . . . . . Ordering Parts . . . . . . . - - . . - - - - - - Soldering Techniques . . . . . . . . . . . . Interconnecting Pins . . . . . . . . . . . - . Square Pin Assemblies . . . . . . . . . . . Multipin Connectors . . . . . . . . . . . . . Semiconductors . . . . . . . . . . . . . . . . . Release Latch Removal . . . . . . . . . . Main Circuit Board (A12) Removal . . Display Circuit Board (A10) Removal Internal Jumpers . . . . . . . . . . . - . . . Test Fixture Connectors . . . . . . . . . . Rear Interface Connector . . . . . . . . . Functions Available . . . . . . . . - . . -
Page 5-1 5-1 5-2 5-2 5-2 5-2 5-2 5-2 5-3 5-3 5-3 5-3 5-4 5-4 5-4 5-5 5-5 5-5 5-5
Section 6
OPTIONS
Section ?
REPLACEABLE ELECTRICAL PARTS
Section 8
DIAGRAMS AND ILLUSTRATIONS Adjustment Locations Block Diagram Schematic Diagrams Parts Location Grids And Reference Charts
Section 9
REPLACEABLE MECHANICAL PARTS
Change Information
DG 504A
LIST OF ILLUSTRATIONS Fig. No . 2-7
2-2 2~ 2-4
2-5 2-6 3-1 5-1
5-2 5-3
Page Plug-in Installation And Removal . . . Controls and Connectors . . . . . . . . . Advantages In Signal Attenuation . . . Frequency Measurement . . . . . . . . . . Period Measurement . . . . . . . . . . . . . Width Measurement
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~ . . . .~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ._ . . . . . . . . . . . . . . . . . . , . . . . _ - , _ . . . - . . . ~ ~. -. ~. ~. ~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~ . .. . . . . . .... . . . . . .. . . . . ..... . . . .. .. . . . . ... . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .' Relationship of display update and counter reset signals . . . . . . . . . . . . . . . . . . . . . . , , , . _ , , , _ , , - . , . ~ Typical Square Pin Assembly . . . . . . . . . . . . . . . . . . . . , . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ Orientation And Disassembly of Multipin Connectors . . . . . . . . . . . . . . . . , , . , , . , _ , , , _ _ . , . . . - . . - . , . Rear Intertace Connector Assignments . . . . . . . . . . . . . . . . . . . . , , . , , , , , , , , , , . , , , , . . . , , - . . . . _ _ . .
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2-2 2~
2-5 2-7
2-8 2-9 3~
5-3 5-3 5-6
NOTE The following illustrations appear in the Diagrams and Illustrations foldout section. &1
Adjustments And Test Points (Display Board) Adjustments And Test Points (Main Board)
Thru
Parts Location Grids
8-2 8-3 8-9
LIST OF TABLES Table No. 1-1
1-2 1-3
2-1
3-1 &2 4-1 5-1
Page E~ectrical Characteristics . . Environmental . . . . . . . . . . Physical Characteristics . . Gate Time vs Measurement
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1-6 ~
2-~ 3-4 3-5
The following fables appear in the Diagrams and Illustrations foldout section. &1
8-5
1-2
. . .. . . . . . . . . . . .., , . . , . , . _ , . , , , . ,, , , . , , , . . . , , -.. . . - . . . - . . . List of Test Equipment Requirements . . . . . . . . . . . . . . . , . . . . . , , , , , , , _ . , , . . - , , . . . , , - _ ~ . Relative Susceptability To Static Discharge Damage . . . . . . . . . . . . . . , . . . . , , , . , , , . , . , , _ , . . . . . _ . . .
NOTE
Thru
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Component Reference Charts
4-2 5-1
DC 504A
OPERATORS SAFETY SUMMARY This general safety information is for both operating and servicing personnel. Specific warnings and cautions will be found throughout the manual where they apply, but may not appear in this summary.
TERMS In This Manual
CAUTION statements identify conditions or practices that can result in damage to the equipment or other property . WARNING statements identify conditions or practices that can result in personal injury or loss of life . As Marked on Equipment CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking, or a hazard to property including the equipment itself . DANGER indicates a personal injury hazard immediately accessible as one reads the marking.
SYMBOLS In This Manual
This symbol indicates where applicable cautionary or other information is to be found. As Marked on Equipment DANGER - High voltage.
This product is designed to operate from a power module connected to a power source that does not apply more than 250 volts rms between the supply conductors or between either supply conductor and ground . A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation . Grounding The Product This product is grounded through the grounding conductor of the power module power cord . To avoid electrical shock, plug the power cord into a properly wired receptacle before connecting to the product input or output terminals. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation. Danger Arising From
Loss of Ground
Upon toss of the protective-ground connection, all accessible conductive parts (including knobs and controls that may appear to be insulating) can render an electric shock. Use The Proper Fuse To avoid fire hazard, use only the fuse specified in the parts fist for your product, and which is identical in type, voltage rating and current rating . Refer fuse replacement to qualified service personnel. Do Not Operate in Explosive Atmospheres To avoid explosion, do not operate this product in an atmosphere of explosive gases unless it has been specifically certified for such operation.
Protective ground (earth) terminal .
Do Not Operate Plug-In Unit Without Covers
ATTENTION - refer to manual .
To avoid personal injury, do not operate this product without covers or panels installed. Do not apply power to the plug-in via a plug-in extender .
Refer to manual
iv
Power Source
SERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Refer also to the preceding Operators Safety Summary Do Not Service Alone
Do Not Wear Jewelry
Do not pertorm internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present.
Remove jewelry before servicing this instrument . Rings. necklaces, and other metallic objects could come into contact with dangerous voltages and currents .
Use Care When Servicing With Power On Dangerous voltages may exist at several points in this product. To avoid personal injury, do not touch exposed conneclions and components white power is on . Disconnect power before removing protective panels, solBering, or replacing components.
Power Source This product is intended to operate from a power module connected to a power source that will not apply more than 250 volts rms between the supply conductors or betwen either supply conductor and ground . A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.
504A COUN7ERlTIMER
DC
VI
Section 1-DC 504A
SPEC1FtCAT10N Instnrment Description The TEKTRONIX DC 504A is a multi-function counter/timer designed to operate in one compartment of any TM 500 or TM 5000-Series power module . Frequency measurements to 100 MHz are within the capability of the DC 504A . Frequencies above 10 MHz are internally prescaled. Measurement of pulse widths and periods at rates up to 2.5 MHz is possible . Width and Period averaging of up to 1000 events is possible. An autorange feature allows the counter to automatically select the gate time (up to one second) or number of averages (up to 100) . A X 100 phase-locked loop multiplier automatically increases display resolution by a factor of 100 in the 10 Hz to 25 kHz frequency range. The 10 MHz internal time base provides a singleshot resolution of 100 ns . Input signals can be ac or do coupled and attenuated by a factor of five . All measurement results are displayed in a six digit LED readout. No options to the standard DC 504A are available.
Standard Accessories 1 Instruction Manual
NOTE Refer to the tabbed Accessories page at the rear of this manual for more information . Performance Conditions The limits stated in the Performance Requirements column of the following tables are valid only if the DC 504A has been adjusted at an ambient temperature between +20°C and +30°C and is operating at an ambient temperature between 0°C and +50°C unless otherwise stated . Information given in the Supplemental Information and Description columns of the following tables is provided for user information only and should not be interpreted as performance check requirements . The DC 504A must be operated or stored in an environment whose limits are described under Environmental Characteristics . Allow at least 30 minutes warm up time for operation to specified accuracy ; 60 minutes after storage in a high humidity environment.
Specification-DC 504A Table 1-1 ELECTRICAL CHARACTERISTICS Characteristics
Performance Requirements
Supplemental Information
INPUTS Input Frequency Range Front Panel
Dc coupled, 0 to 100 MHz Ac coupled, 10 Hz to 100 MHz
Rear Interface
Dc coupled, 0 to 50 MHz AC coupled, 10 Hz to 50 MHz
Input Sensitivity x 1 Attenuation
X 5 Attenuation Accuracy
30 mV rms sinewave (85 mV p-p) to 100 MHz 85 mV p-p pulse at a minimum width of 5 ns Within 2% at do
Input Dynamic Range X1
2.0 V p-p signal within a ± 2.0 Vdc window
XS
10 .0 V P-p window
Trigger Level Range
signal
within
a
± 10 .0 Vdc
Typically greater than ±2V X attenuator setting.
Maximum Safe Input Voltage Front Panel X1
200 V pk ; 400 V p-p from do to 50 kHz, derate to 15 V p-p from 1 .33 MHz to 100 MHz
X5
200 V pk ; 400 V p-p from do to 5 MHz, derate to 20 V p-p at 100 MHz
Rear Intertace
~avpk
Input Impedance Front Panel xt, x5
1 Mit, paralleled by approximately 25 pF
Rear Interface x1, x5
50 ohms ± 10% at do
1-2
REV JUL 87
Specification-DC 504A Table 1-1 (cont.) Supplemental Information
FUNCTIONS Frequency to 10 MHz Range
Dc coupled, 0 Hz to 10 MHz Ac coupled, 10 Hz to 10 MHz
Accuracy
± 1 count ± time base error X freq
Gate Time
10 ms to 10 sec, selectable in decade steps, or autoranging (10 ms to 1 sec only)
Resolution
°'~ c
Non-phase-locked
100 Hz to 0.1 Hz, selectable in decade steps, or autoranging (100 Hz to 1 Hz only)
Phase Locked
1 Hz to 0.001 Hz, selectable in decade steps, or autoranging (1 Hz to 0.01 Hz only)
Lock Range
10 Hz ~ Freq , 25 kHz
Multiplication
X 100
Lock Time
~ 5 seconds
Phase Lock Loop automatically increases resolution whenever loop locks. PLL defeat can be accomplished by an internal jumper .
Frequency to 100 MHz Range
Dc coupled, 0 Hz to 100 MHz Ac coupled, 10 Hz to 100 MHz
Prescale Factor Accuracy
± 1 count ± time base error X freq
Gate Time (Resolution)
10 ms to 10 sec (1 kHz to 1 Hz). Selectable in decade steps, or autoranging (10 ms to 1 sec only).
Period AVG Freq Range
._ [ ~9
L
Performance Requirements
Characteristics
__
Dc coupled, 0 Hz to 2 .5 MHz Ac coupled, 10 Hz to 2 .5 MHz
Overflows above 99999.9 ~s (100 ms)
Number of Averages (N)
10° to 10', selectable in decade steps, or autoranging (10° to 10 2 only).
Resolution
100 ns to 100 ps, selectable in decade steps or autoranging (100 ns to 1 ns only).
Accuracy
± 10Nns ± time base error X period + 1 .4
X /trigger fitter erro r N
Specification-DC 504A Table 1-1 (cont.) Supplemental Information
Performance Requirements
Characteristics Width_i'1. AVG Freq Range
Dc coupled, 0 Hz to 2.5 MHz Ac coupled, 10 Hz to 2.5 MHz
Slope
Positive
Number of Avgs (N)
10° to 103, selectable in decades, or autoranging (10° to 10z only) 100 ns
Resolution
±
Accuracy
~
± time base error X width
start trigger jitter error stop trigger jitter error
+ (stop slew rate error -start slew rate error) ± 10 ns Width ~.J - AVG Freq Range
Dc coupled, 0 Hz to 2 .5 MHz Ac coupled, 10 Hz to 2.5 MHz
Slope
Negative
Number of Avgs (N)
10° to 103, selectable in decades, or autoranging (10° to 10 z only)
Resolution Accuracy
+ 100 ns + time base error X width + start trigger jitter error stop trigger jitter error + (stop slew rate error -start slew rate error) ± 10 ns ,
Specification-DC 504A Table 1-1 (cont-) Characteristics Totalize Freq Range
Dc coupled, 0 Hz to 10 MHz Ac coupled, 10 Hz to 10 MNz
Trigger Jitter Error (in acs rms) _
(ert )z + 2 (e~Z) (v) Input stew rate at trigger point (V/~s) where e~, = 150 ~V rms typical internal noise e~z = rms noise of the signal input at the trigger point for a 100 MHz bandwidth .
A
=
t
J
I
Input hysteresis (V) 2 Input slew rate I at trigger point (Vlus) where Input hysteresis = 30 mV p-p typical.
~o
N = Number of periods averaged in PERIOD AVG, or the number of widths averaged in WIDTH AVG or WIDTH AVG -LJ- . Time base error is the sum of all errors specified for the time base.
Time Base --ut
a ~
i ul
t
Trigger slew rate error in ~s =
_
a :o L
Overflows above 999999. Display update run/hold will hold display while counter continues to advance . Releasing run/hold will update display to new value.
NOTES :
s `~
a
Supplemental Information
Performance Requirements
l
Frequency (at calibration Adjustment Resolution Temperature Stability (o°c to +so~c) Aging External Timebase Input
10 MHz ± 1 X 10- ~ ± 5 X 10 - e ± 5 X 10 - e ( ± Sppm) _ 1 X 10 - blyr (~ tppm/yr) 10 MHz
Must Drive one HC Logic family load plus 100 K pull-down resistor V~H = 3.7 V/40~A minimum Vii = 0.95 V/10~A maximum
_J _
_ ;~
i :rt
REV SEP 1984
Specification-DC 504A Table 1-2 ENVIRONMENTAL' Description
Characteristics
Meets MIL-T-288008, class 5.
Temperature Operating
0°C to +50°C
Nonoperating
-55°C to +75°C
Humidity
95% RH, 0°C to 30°C 75% RH, to 40°C 45% RH, to 50°C
Meets MIL-T-288008, class 5.
Meets MIL-T-288008, class 5.
Altitude Operating
4.6 km (15,000 ft)
Nonoperating
15 km (50,000 ft) Meets MIL-T-288008, class 5, when installed in qualified power modules.°
Vibration
0.38 mm (0 .015") peak to peak, 5 Hz to 55 Hz, 75 minutes .
Shock
30 g's (1/2 sine), 11 ms duration, 3 shocks in each direction along 3 major axes, 18 total shocks .
Meets MIL-T-288008, class 5, when installed in qualified power modules°
Bench Handling
12 drops from 45°, 4" or equilibrium, whichever occurs first.
Meets MIL-T-288008, class 5 when installed in qualified power modules.°
Packaged Product Vibration and Shock`
qualified under National Safe Transit Association Preshipment Test Procedures 1 A-B-1 and 1 A-B-2.
Electrostatic Immunity
20 kV maximum charge applied to instrument case.
Electromagnetic Compatibility°
Within limits of F.C .C . Regulations, Part 15, Subpart J, Class A; VDE 0871 ; and MIL461 A tests RE01, CE01, CE03, RS01, RS03, CS01, and CS02 .e ENVIRONMENTAL EXCEPTIO NS
Temperature
During low temperature test 4.5 .5 .1 .3 (b) for class 5, steps 4 and 5 shall be performed before step 2. Also, the instrument shall not be operating during step 6, paragraph 4.5 .5 .1 .3 (e), class 5. While operating, condensed moisture shall not be present on class 5 instruments . Drying of the instrument for this class may be performed in a suitable chamber, if necessary.
'With power module.
°Refer to TM 500/5000 power module specifications. `Without power module.
°System performance subject to exceptions of power module or other individual plug-ins . Within 4 d8 of RE02 spec at 140 MHz and 150 MHz.
Table l-3 PHYSICAL CHARACTERISTICS Characteristics
Description
Finish Front Panel Chassis
Poiycarbonate ; Chromate conversion coated aluminum
Net Weight (nominal)
I 794 g {1 314 lbs.)
Physical Qimensians (nominal) Height Width Length
'
I 126.0 mm (4 .96 inches) j
65 mm (2 .5 inches) 278.8 mm (10.98 inches)
Section 2-DC 504A
OPERATING INSTRUCTIONS Introduction
NOTE
This section of the manual provides operating information required to obtain the most effective pertormance from the DC 504A. InGuded is a functional description of the front panel controls and connectors, operating considerations, and basic measurement techniques. Also included are installation instructions and repackaging information.
Rear interface information is foundin the Maintenance section of this manual. Refer the interface connec tions to qualified service personnel.
INSTALLATION AND REMOVAL
PREPARATION FOR USE First Time Inspection Inspect the instrument for visible damage (dents, scratches, etc.). Keep the original shipping container and packing material for future use. If the instrument is damaged, notify the carrier and the nearest Tektronix Service Center or representative . Operating and Non-Operating Environments The instrument can be operated, stored, or shipped within the environmental limits stated in the Specification section of this manual. However, the counter should be protected at all times from temperature extremes which can cause condensation within the instrument. Rear Interface Considerations A slot between pins 21 and 22 on the rear connector identifies this instrument as a member of the TM 500 counter family . If the counter is used to build a system, insert a family barrier key (Tektronix Part No. 214-1593-02) in the corresponding position of the selected power module jack to prevent plug-ins belonging to a different family from being used in that compartment of the power module .
WARNING To avoid electric shock, disconnect the power module power cord before inserting the family barrier key in the power module jack. Refer the barrier key insertion to qualified service personnel.
NOTE Refer to the Operator's Safety Summary in the front of this manual before installing this instrument in the power module. Refer to the power module instruction manual and make sure that the line selector block is positioned cerrectly for the line voltage in use. Check the counter and the power module for the proper fuses. Be certain that the power plug for the power module has the proper grounding conductor. cAVT~o~ To prevent damage to the instrument, tum the power module off before installation or removal from the power module. Do not use excessive force to install or remove the instrument from the power module. Check to see that the plastic barrier keys on the interconnecting jack of the selected power module compartment match the cutouts in the rear interface connector for the counter. If they do not match, do not insert the counter until the reason is investigated . If the cutouts and barrier keys match, align the chassis of the counter with the upper and tower guides of the selected compartment. See Fig. 2-1 . Insert the counter into the compartment and press firmly to seat the rear interface connec tor . Apply power by operating the POWER switch on the power module .
Operating instructions-DC 504A
POWER MODULE
jI ~ Ii
j~
Lockout G `
Lockout
Slot
PLUG-IN Bottom Groove
(t 43 t-2y 346a-02
Fig . 2-1 . Plug-in installation and removal.
OVERFLOW-when illuminated, indicates register overflow .
To remove the counter from the power module, turn off the POWER switch, pull the release latch knob (located in the lower left front comer) until the interconnecting jack disengages. Pull the counter straight out of the power module compartment.
CONTROLS AND CONNECTORS Although the DC 504A is fully calibrated and ready to use, the location and function of the Controls and connectors should be reviewed before attempting to operate it . Following is a brief description of the front panel controls and connectors. Refer to Fg . 2-2 .
O 1
READOUT DISPLAY-six digit LED readout with automatically positioned decimal point and leading zero suppression . Display reads in KILOHERTZ or MICROSECONDS . GATE-indicates the status of the main gate . When illuminated, the gate is open ; the instrument is in the process of making a measurement. When extinguished, the gate is closed :
2-2
MULTIPLIER LOCK-illuminated when the Multiplier (Phase Lock Loop) circuit is active. The Multiplier is automatically activated when measuring frequencies , between 10 Hz and 25 kHz. This circuit multiplies the measured frequency by 100, providing two additional digits of display resolution .
O
FUNCTION-selects the following measurement or counting modes fa the instrument . FREQ TO 10 MHz-measures directly and displays the frequency of input signals up to 10 MHz . FRED TO 100 MHz-internally prescales and disp~ays the frequency of input signals up to 100 MHz. PERIOD-measures and displays the period of the input signal .
Operating Instnrctions-DC 504A
KIIC;+tFRFi=RiiCRt1SFi;t3NIIS
INP13T
Fig. 2-2. Controls and Connectors.
2-3
Operating Instructions-DC 504A WIDTH J-L -measures and displays the time interval between the triggering point on the positive leading edge to the corresponding point on the trailing edge of a pulse applied to the input. WIDTH ZJ- -measures and displays the time interval between the triggering point on the negative leading edge to the corresponding point on the trailing edge of a pulse applied to the input. TOTALIZE-pulses applied to the input will be displayed in a running total until the counter is manually reset or register overflow occurs . TIME/AVGS-depending on the position of the FUNCTION switch, selects the gate time or the number of measurements to be averaged . In AUTO, a gate time that will display six digits is automatically selected . O7
RESET-resets the count to zero when operating in the TOTALIZE mode. Acts as a master reset ensuring that the readout has been cleared before the next measurement. Also provides a check of all display LED's; when pressed and held, a row of 8's is displayed.
O
DISPLAY UPDATE-when the button is in the RUN (out) position, the DC 504A counts or makes measurements continuously . When the button is in the HOLD (in) position and the instrument is in a measurement mode, the last measurement is displayed and no more made until the button is released . When the instrument is counting (TOTALIZE), moving the button to the HOLD position stops the display only ; the count continues to accumulate in the registers . When the button is released, the display is automatically updated to the current count accumulation and continues to run. TRIGGER LEVEL-selects the amplitude point on the positive or negative sbpe of tt~e input signal at which the triggering window is placed .
10
ATTEN-selects the attenuation factor for the input signal . When the button is in the X 1 (out) position the input signal is not attenuated . The input signal is at tenuated by a factor of five when the button is in the X5 (in) position .
11
COUPL-selects the method of coupling the input signal to the counter . When the button is in the DC (out) position, the signal is applied directly . The input signal is capacitively coupled to the input when the button is in the AC (in) position .
12
Input Connector to the counter. Input impedance is 1 MS2 shunted by approximately 25 pF . ~ peak .
Maximum input amplitude is limited to 200 V
Release Latch-disengages the instrument for removal from the power module . Provisions have been incorporated in the DC 504A to modify the following operating conditions . Multiplier (PLL)-the instrument is shipped with the multiplier circuit in the enabled condition. This circuit can be disabled if desired. Time Base-the instrument is shipped with the internal time base connected. This can be disconnected to permit application of an external clock signal via the rear interface. Signal Input-the instrument is shipped with the front panel input connected. Disconnecting this input allows signal measurements to be made via the rear interface. WARNING Refer qualified service personnel to the Maintenance Section to make changes to the above operating conditions.
Operating Instructions-DC 504A
OPERATING CONSIDERATIONS INPUT CONNECTIONS
Input Coupling, Noise, and Attenuation You can use either the ac coupling (AC COUPL) or do coupling (DC COUPL) mode to couple the input signal to the input amplifier. If the signal to be measured is riding on a do level, its amplitude limits may not fall within the triggering level range. The AC COUPL mode should be used for repetitive signals having a fixed frequency and a constant duty cycle when they are riding on a large do level.
Maximum Safe Input Voltage Limits
CAUTION To avoid instrument damage, make certain that the input voltages to the front panel connectors or rear interface inputs do not exceed their specified limits. See Specification section. Be careful with high-frequency, high-amplitude signals. The front panel maximum safe input voltage (X1 attenuation) is Berated linearity from 400 V p-p at 50 kHz to 15 V p-p at 1 .33 MHz and higher . Refer to the Specification section. Connecting External Signal Sources If a high impedance signal probe is to be used between the front panel bnc connector and the measurement source, use a probe capable of compensating for the input capacitance of the counter (less than 30 pF). A high impedance probe such as the TEKTRONIX P6125, is recommended for alt digital logic applications .
If the signal duty cycle changes during a measurement, the triggering point will shift, possibly causing erroneous results . Use the DC COUPL mode for low frequency ac signals without large do offset, signals with a low duty cycle, and during width measurements . Noise may tie coupled to the input amplifier along with the signal to be measured . Noise may originate from the operating environment, the signal source, or be caused by improper connections . If the noise is of sufficient amplitude, it can result in inaccurate measurements due to false triggering . Using an external attenuator may solve the problem . See Fig. 2-3. The input dynamic range specification describes the largest amplitude signal with a risetime or falltime less than about 5 ns that will not cause ringing and distortion internal to the counter. Ringing may cause mistriggering near the positive or negative peaks of the signal .
Noise Hysteresis Window
Attenuated Signal Triggering level
Shaped Out Erroneous Count
Correct Count (3464-04A14291-03A Fig. 2-3. Advantages in signal attenuation .
REV JUN 1983
2-5
Operating Instructions-OC 504A The minimum signal amplitudes are defined by the input sensitivity requirements for the AC COUPL and DC COUPL modes (see Specification section). Proper use of the ATTEN (attenuation) control will ensure operation within the maximum limits ; ± 2 V for X 1 ATTEN, ± 10 V for X 5 ATTEN.
"
Average the measurement over a larger number of cycles of the input signal (greater number of AVERAGES).
Triggering The TRIGGER LEVEL and COUPL controls affect the counter's ability to make a measurement. In general, the trigger controls are similar to oscilloscope controls, except that the end result is not a stable waveform graphic display, but a stable digital frequency display. Input Coupling Switch . The Input Coupling switch selects ac (capacitive) or do (direct) coupling for the input signal . Ac coupling is convenient for most frequency measurements to avoid readjusting the TRIGGER LEVEL control for changing do levels. It does, however, reduce sensitivity to signals below 10 Hz . Thus, for period measurements longer than 0.1 sec, do coupling should be used. Trigger Level. The TRIGGER LEVEL control must be properly adjusted for a stable reading. It is not difficult to adjust unless the signal amplitude or frequency is close to (or beyond) the specified limits. A signal that looks stable on an oscilloscope may still show jitter when measured with a digital counter. If the count varies from reading to reading, it is probably due to jitter in the signal source . If the count changes dramatically, the DC 504A is not being triggered properly, either because the controls are not set right or the signal is beyond the counter's capabilities (too small in amplitude or too high in frequency). The TRIGGER LEVEL control allows the operator to move the hysteresis window of the trigger circuit to an optimum level on the input signal to ensure stable triggering. The TRIGGER LEVEL control adjusts over a nominal ±2 .0 V range of the input signal . if a wider range is desirable, use the X5 input attenuator for ± 10 V range.
Reducing Measurement Errors As an aid in reducing measurement errors, keep in mind the following factors: Use the proper ATTEN control and high impedance attenuator type probes when measuring signals from high impedance circuits .
2-6
Consider trigger errors caused by input signals with slow rise or falltimes .
Maintain the counter environment at a constant temperature . "
Apply a 10 MHz external time reference standard to the rear interface inputs .
"
Perform internal adjustments, if necessary.
FRE('~UENCY MEASUREMENTS Use ac coupling for most frequency measurements to avoid readjusting the LEVEL control because of changing do levels: Signals less than 4 volts peak-to-peak need not be attenuated ; larger signals should be attenuated to within the range of 85 mV to 4 volts peak-to-peak. Set the FUNCTION switch to FREQ TO 10 MHz and, with the TIME/AVGS switch, select one of the shorter gate times. Connect the signal to be measured to the input and adjust the TRIGGER LEVEL control for a stable display. The level control setting is not critical unless the signal amplitude and frequency are close to specified limits . Fig. 2-4 shows waveform timing during frequency measurement. Measurement Intervals To adjust the trigger control, choose a short gate time such as 0.1 or .01 seconds. This gives rapid feedback via the display as to whether or not the counter is being triggered. Final selection of gate time depends upon the frequency being measured, desired resolution, and the time required to make a measurement. A 10 second gate time requires 10 seconds for a measurement to be made and displayed. This gives 0.1 Hz resolution . See Table 2-1 . Overflow Through intentional use of overflow displays, it is possible to increase the resolution of the counter. Select a gate time that displays the most significant digit as far to the left as possible without overflow . Note the numbers displayed to the right of the decimal. Move the decimal to the left, by selecting longer gate times, until the desired resolution is
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Operating Instructions-DC 504A
TIME BASE 10 MHz (100 ns) GATE (.01/0.1/1.0/10 sec) INPUT SIGNAL (Unknown) ACCUMULATOR INPUT (Count Displayed CounUUnit Time) a29~Oo
Fig. 2-4 . Frequency Measurement . achieved. The OVERFLOW indicator will light when the most siynificant digit has overflowed the last storage register . The relationship between gate time and resolution is shown in Table 2-1 .
Table 2-1 GATE TIME VS. MEASUREMENT RESOLUTION Gate ( FRED TO Time 10 MHz .01 0.1 1 .0 10
sec sec sec sec
100 Hz 10 Hz 1 Hz 0.1 Hz
I
FREQ TO 10 MHz Multiplier Locked 1 Hz 0.1 Hz .01 Hz .001 Hz
FRED TO 100 MHz 1 kHz 100 Hz 10 Hz 1 Hz
the DC 504A, because it is multiplied by 100 (the counter is actually measuring 500 kHz), would display 5.00000 kHz with one second of gate time. Since any frequency within the range of the multiplier will be multiplied, provision has been incorporated to lock out this feature if so desired. Refer qualified service personnel to the Maintenance Section . A front panel LED indicates when the multiplier is locked. The multiplier circuit is only active when the DC 504A is in this mode.
NOTE When the multiplier is locked and a gate time of 10 Sec is selected, no decimal point appears . The decimal point is implied to the left of the sixth digit (MSD).
Frequencies Lower Than 10 MHz
Frequencies Higher Than 10 MHz
Frequencies 10 MHz and below are measured with the FUNCTION switch in the FREQ TO 10 MHz position: Frequencies within the range 10 Hz to 25 kHz are automatically multiplied internally by 100 to increase display resolution . This is accomplished by routing the incoming signal through a phase-locked loop multiplier circuit before it is counted . If, for example, a 5 kHz signal is to be measured with a conventional counter, the display would read 5 .000 kHz with one second of gate time . The same signal measured with
Frequencies between 10 MHz and 100 MHz are measured with the FUNCTION switch in the FREQ TO 100 MHz posilion . Input frequencies in this range are internally prescaled (divided) by a factor of 10. If, for example, a frequency of 95 MHz is to be measured, the prescaler divides it down'so the counter is actually measuring only 9.5 MHz. This, however, also reduces the display resolution by a factor of 10. Resolution can be increased, if desired, by selecting a longer gate time.
Operating Instructions-DC 504a
PERIOD MEASUREMENTS The PERIOD mode reverses the functions of signal and clock as compared to the frequency mode. In frequency mode, signal events are counted for some number of clock pulses, then displayed. In PERIOD, clock pulses are counted for some number of signal events then displayed. Refer to Fg. 2-5. Low Frequencies Period measurements of signals below 10 Hz, and particularly in the lowest decade from 0.1 Hz to 1 .0 Hz, are sensitive to wave shape and amplitude . Since it is desirable for the signal to~pass through the trigger hysteresis abruptly, square-wave inputs are preferred_ Sine and triangle waves can be measured accurately at the very low end if the input amplitude is kept somewhat above minimum specification so that the trigger input is driven hard.
ing up to 1000 is attainable, which results in a directly proportional increase in resolution . If, for example, the resolution of a single period measurement is 100 ns, averaging 1000 events results in a 1000 times increase in resolulion, or 100 ps. To illustrate the display readout, assume an input signal with a 1 .0032 ks period . A single period measurement would display 1 .0 us (100 ns LSD). Averaging 10 periods of this same signal would display 1 .00 ~s (10 ns LSD) and 100 periods would display 1 .003 ~s (1 us LSD). With a 1000 period average the display will read 1 .0032 ~s (100 ps LSD). In the AUTO mode, the counter always attempts to fill the display (6 digits) while averaging up to 100 events . Note that periods longer than 100 ms will overflow the display.
WIDTH MEASUREMENTS
Period Averaging The best single shot resolution attainable in a period measurement is a direct function of the speed (frequency) of the time base clock being counted. The DC 504A has a 10 MHz time base; a single period of this time base is 100 ns (period = 1/frequency). Therefore, the resolution of a single period measurement is 100 ns. Resolution can be increased by utilizing the capability of the DC 504A to average period measurements . Period averag-
The width modes measure the waveform . These two points GER LEVEL control such that selected level and turns off at site slope. Refer to Fig . 2-6 .
time between two points on a are selected with the TRIGthe main gate turns on at the the same level but the oppo-
Width Averaging Averaging can be used to increase the accuracy and resolulion of repetitive signal measurements . The basic reason for
E E E E E
INPUT SIGNAL
(Unknown)
GATE (1110/10011000 X INPUT) TIME BASE 10 MHz (100 ns) ACCUMULATOR INPUT (Count Displayed Time/Unit Count) a29tO5
Fig. 2-5. Period Measurement .
2-$
I
Operating Instructions-DC
10"
Widths
INPUT SIGNAL (Unknown)
Lv Lv L~
4 :~:7
ae , _
GATE (11101100/1000 X INPUT)
Sf
nME sASE 10 MHz (100 ns) ACCUMULATOR INPUT (Count Displayed TimelUnit Court)
.;
L er ,
az9iU6
ti e ~~ a ,~ s
L~a
s
L.._ a
504A
Fig. 2-6 .
Width Measurement
averaging is the statistical reduction of the ± 1 count error. If the ± 1 count error is truly random, then as more intervals are averaged, the measurement will tend to approach the true value of the time interval. For time interval averaging to work, the time interval being measured must be repetitive and have a repetition frequency that is nonsynchronous to the counter clock rate. The DC 504A has the capability of width averaging up to 1000 events. This single input measurement is much easier than typically associated with Universal Time Interval Counters . NOTE Width J1 and Width ZP-require an arming pulse before a measurement begins. !n the case where a stream of pulses is being measured, this presents no problem as the first pulse will arm the measurement, and the next 'N' pulses will be measured. Il a single pulse is to be measwed, the carnter can be put into the armed mode by rotating the triggerlevel completety clockwise, then counter-Gockwise until the GATE indicator just turns on (it may require two rotations). The counter is then armed and will measure the next pulse it sees.
TOTALIZING
In the Totalize mode, signal events applied to the INPUT are counted and the accumulated total is displayed until the re-
set button is pushed or the FUNCTION switch is changed to another position. This mode is a manual analog of the frequency mode. its main application is to accumulate a count of relatively slow and irregular events . Starring the Count
Apply the signal to the input connector and set the trigger controls the same as for frequency measurement . Adjust the TRIGGER LEVEL control until the displayed total begins to increment . The accumulated count is displayed in whole numbers . In the Totalize mode, only the TRIGGER LEVEL control, the RESET button and the DISPLAY UPDATE button affect the display. NOTE In the TOTALIZE mode, moving the DISPLAY UPDATE button to the HOLD position stops the display only; fhe count continues to accumulate in the registers . Releasing the button fo the RUN position updates the display to the current register accumulation and the count display continues from there . REPACKAGING FOR SHIPMENT
Should it become necessary to return the instrument to a Tektronix Service Center for service or repair, attach a tag to the instrument showing the owner (with address) and the name of the individual to be contacted, complete instrument serial number, option number, and a description of the service required .
2-9
Operating Instructions-DC 504A If the original container and packaging material is unfit for use or not available, repackage the instrument as follows:
3. Cushion the instrument on all sides by tightly packing dunnage or urethane foam between carton and instrument, allowing three inches on all sides.
1 . Obtain a carton of corrugated cardboard having inside dimensions no less than six inches more than the instru ment dimensions : this will allow for cushioning . The shipping carton test strength for the DC 504A is 200 pounds .
4. Seal the carton with shipping tape or industrial staples.
2. Surround the instrument with polyethylene sheeting to protect the finish.
5. Mark the shipping carton "FRAGILE INSTRUMENT" to indicate special handling .
Warning Thefollowing servicing instructions arefor use only vy qualified personnel. To avoidpersorxrxel irxjury, do riotperform any servicing other than that contairxed irx the operating instructions unless you are qualified to da so. Refer to Gerxeral Safety Summary and Service Safety Summary prior to performing axxy service.
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Section 3--DC 504A
THEORY OF OPERATION Introduction
This section of the manual contains a description of the electrical circuits of the DC 504A . Refer to the block diagram and schematic diagrams on the foldout pages in the rear of the manual to aid in understanding this description . Diamond enclosed numbers appearing throughout this section refer to the schematic diagram on which the circuit being discussed is located . The schematic diagrams are divided with gray-tint blocks according io circuit function . The titles correspond to those shown on the block diagram. Blcsck Diagram
The block diagram shows tfie stages and basic interconnections of each major circuit in the instrument. Each circuit is described in detail. Use the block diagram and detailed circuit diagrams for reference. input Cor+ditioning
Input signals are applied to front panel connector J4015, or through connections at the rear interface. The position of Input selector jumper P4014 selects either front panel or rear interface input. Input to the rear interface is terminated in 50 0 (84015) to allow connections using standard 50 St coaxial cable. input signals pass through DCIAC coupling switch S4024 into a frequency compensated attenuator network . Attenuator switch S402S is normally in the X 1 position, which allows the signal to pass directly through. Five times attenuation is provided by 84023 and 84024. 0#021 and 04025 provide frequency compensation . 84028 is the 1 MSi, input termination . 84032, 84036, and 04036 serve to limit current to grid compensate for capacitance around the gate of 04022. Overvoltage protection is provided by 084032 and 084037 . These diodes clamp the signal at approximately ± 5.5 V . A matched pair of FET's, X4022 and 04023, form a high impedance differential comparator. Constant current to ibis amplifier is supplied by Q4021 with associated circuitry. The voltage at tl3e gate of Q4023 is set by the TRIGGER LEVEL control (84037}. This voltage is divided across 84033 and 84034 to approximately ±2 .2 V. The output of the comparator drives a three stage line receiver, the inputs of which are pins 9 and 10 of 030228 . The
the first stage matches the impedance of the comparator to amplifier with a is a voltage second stage amplifier. E13022A is 1130220, . The third stage, three gain of approximately configured as a Schmitt trigger circuit. High frequency peaking is accomplished by 03021 _ This stage serves to shape counter. the inputs into fast edge outputs which feed to the Signal Ro~rting
Output from the Schmitt trigger is routed through one of three paths to the counter circuit. Qepending on the function or frequency range selected, signals pass directly, through a x-10 prescaler, or through a X 100 restitution multiplier (phase-locked loop) to the counter . DIRECT . This routing to the counter is through a switching circuit composed of tJ1p63A, Q1066, and Q1068. For ail signals, except frequerscies to tae multiplied ar divided, ar negative pulse measurements, Q1fl68 turns off and the signal path is through Q1066. Vrlhen the instrument is set to measure negative pulse width, 01066 turns off and the signal path is through Q1068. When measuring frequencies higher than 10 MHz, Q1066 and iD1068 are both turned off and the path is through the ~ 10 Prescaler, 02087. The output of the switch'ng circuit is fed to pin 9 of U1063B . TTL The differential outputs of 010638 drive an ECL to are converter outputs G11064 . The converter, Q1fl62 and directly and applied U1048A and 010488 through inverted to the A and B inputs of the counter, 02047 (Diagram 3) . PRESCALER . Inputs at frequencies from 10 MHz to 100 MHz are routed through a ; 10 prescaler . In this mode, both transistor switches (Q1066 and 01068) are off and the signal is applied to the input (pin 7) of 02067 . This integrated circuit is a -:-10 counter; the output frequency is one-tenth the input frequency. The prescaler output (pin 15) connects to pin 10 of 1110638 . The signal then routes through the ECL to TTL converter to the counter circuits. The prescaler is enabled when pin 9 is pulled low through 52061 A in the FREQ TO 100 MHz positIOR . X100 MULTIPLIER . With the FUNCTION switch in the FREC3LJENCY TO 10 MHz position, inputs ranging between 10 Hz and 25 kHz route to a X100 Resolution Multiplier
Theory Of Operation--DC 504A (phase-locked loop) circuit. This is an automatic function unless the loop is disabled by moving jumper P1040 (PLL Defeat) to the ground position. Transistor 01056 serves as an ECL to TTL converter. The input signal is buffered and inverted by U1052D and fed to pin 14 of 02054. (The output signal from U1052D is +5 V to -5 V). This integrated circuit consists of a phase comparefor and voltage oonfrolled oscillator. Only the phase comparator is utilized . The phase of the signal at pin 14 is compared to the phase of the signal at pin 3. The output at pin 13 determines the oscillator frequency. The voltage controlled oscllator (VCO) consists of U1044A, B, C, 01053 and 611054. To understand the operation of the oscillator circuitry, assume that the emitter of 01054 is at about +5 V. Cun-ent fbws through U1044A and R1046 charging capacitor C1052. Pin 10 of 010440 is at about +5 V and pin 12 at about -5 V. 01054 is fumed off, with its base at about +5 V. The drain of U1044A goes negative at a rate determined by the can-ent flow through it. When the voltage at the drain of U1044A drops to about 0 V, pin ~ 2 of 010440 switches to about +5 V and pin 8 of 010448 goes low fuming 01054 on . As can-ent flows through 011054, the voltage drop across R1046 increases tuming .on 01053. Current flow through 01053 is much greater than through U1044A and pin 10 of 010440 rises rapidly until 010440 and 010448 change state . This turns off 01054 and repeats the cycle. The output wavefonn at the collector of 01054 is a fast spike from about -5 V to about 0 V. The frequency of the circuit varies from about 500 Hz to about 3.5 MHz. This is accomplished by varying the current through U1044A and consequently the charge time of 01052. The positive going (-5 V to 0 V) spike, at varying frequenties, feeds to U1052A, is buffered, inverted and applied to the input of 01032 (pin 4) . This integrated circuit (U1032A and B) divides the output frequency by 100. The output of 01032 (pin 13) feeds through 01043, a TTL to MOS converter, to the second input of the phase comparator (02054 pin 3) . If the frequency of the waveform at the collector of 01054 goes higher than exactly 100 times the input (pin 14 02054), the output voltage at pin 13 of 02054 goes more negative, reducing the oscllator fn~uency until both frequencies are in lock . The oscillator output at pin 3 U1052A feeds through 010528 and 010630, is converted to ECL levels and ailplied to the third input, pin 11, of 010638 . When the arcuit is out of lock, pin 1 of 02054 goes low tuming 01057 on and 01052 off. This results in a high at the output (pin 8) of 010520 . This high is applied to pin 9 of 010318 (Diagram 5) causing its output to go low. This low
3-2
at pin 13 of U 1048E causes its output to go high extinguishing the MULTIPLIER LOCK indicator (Diagram 4) . When the loop is locked, the output of 010520 goes low and the indicator is on.
Counter O3 The counting circuitry for the DC 504A is contained almost entirely in one integrated circuit package 02047. With the exception of R2051, 02051, 02052, 02053, and a 10 MHz crystal (Y2054), the time base circuit is internal to the pack age. Range, function detection, switching circuitry, time sbt, and display segment decoders and drivers are contained in the package. The external oscillator input to the counter at pin 33 is connetted to the buffered internal time base output, pin 38 . Counter timing can also be from a clock signal external to the instrument by moving P2042 to the Ext position. This signal is taken from pin 14A on the rear interface and buff ered by 020270 . Variable capacitor 02051 serves to compensate for variations in the 10 MHz crystal and wilt vary the ~ciNator fre quency several hundred Hertz. The counter has two inputs for measured events ; input A (pin 40) and input B (pin 2). All signals to these inputs come through the ECL to TTL converter circuit (Diagram 2). All events to be counted, except width, are applied to input A. In the width mode, the counter measures the time interval between an event on A input and an event on B input. For example: in the width positive mode, the rising edge of the pulse triggers input A starting the count, and the failing edge triggers input B stopping the count. There are four other inputs that set the counter to measure and display signals applied to inputs A and B. These inputs are: Range (pin 21), Function (pin 4), Control (pin 1), and Ext Decimal Point (pin 20). The counter digit drive (time slot) outputs, through the range and function select circuitry, provide the caitrol signals . This is discussed in more detail under the heading Range and Function Selection. The Run/Hold function is controlled by front panel pushbutton switch S3032. When the switch is in the RUN (out) position, pin 39 of 02047 is low through 03031 . When the switch is moved to the HOLD (in) position, pin 39 is at +5 V stopping the counter. The last complete measurement made is displayed. When operating in the TOTALIZE mode, activating HOLD stops only the display; the punter continues to accumulate information . Returning to RUN updates the display to the data in the accumulator and the count continues.
L _~ -
__ a -a1 ,a a ,af
Theory Of Operation-DC 504A low when the gate is open and the counter is making a measurement. This output is buffered and inverted through U1048D . The high output from 010480 turns the pulse stretcher circuit on, Q2023 and X2027 (Diagram 4), which illuminates the GATE indicator . This circuit lengthens short gate pulses (to approximately 50 ms) so that the GATE indicator is on long enough to be visible.
The Reset Input, pin 19, is high when the counter is running . Moving S3012A (RESET) to the reset position resets the counter to zero and clears the display. With S3012A in this position, pin 12 of U1031C (Diagram 5) is also pulled low enabling the gate and allowing TS8 to pass through the gate. TS8 is inverted through 01031 A and applied to the counter Control Input, pin 1 . During TS8, the counter Display Test function is activated and all segments and decimal points in the display are illuminated .
The STORE (pin 5) and RESET (pin 32) outputs latch and reset the autorange circuit . See Autorange . Refer to Fig . 3-1 for the Gate, Store, and Reset relationship.
The BCD outputs, pins 6, 7, 17, and 18 are used to detect display zeros. The BCD information is applied to U1037A which triggers the autorange circuitry . Additional details are contained in the discussion on Autoranging .
The digit select and segment drive outputs drive the display elements directly . However, because these outputs are neither TTL nor CMOS compatible, they are routed through level shift circuitry to drive the Range and Function Select components . The level shift circuit consists of a pair of
The Measurement In Progress output at pin 3 is used to drive the front panel GATE indicator. The level at this pin is
s ~
~---GATE
t _ -~
MEASUREMENT IN PROGRESS
190-200 ms
-1
sroRE 30-40 ms ~
~
(E 60 ms
RESET OUT
GATE -
Nigh for length of time selected with TIME/AVGS switch .
MEASUREMENT IN PROGRESS -
Low for length of time gate is open; illuminates GATE indicator during this time. High for approximately 200 ms between measurements.
STORE -
Clears and updates display latches.
RESET OUT -
Clears counters; ready for next measurement . a29~O7
Fig. 3-1 . Relationship of display update and counter reset signals . 3-3
Theory Oi Operation-DC 504A quad-comparators 02043 and 02045. The reference voltage (minus input) of each unit is set at +2 .5 V through divider R2034 and R2035. The open collector output of each device is pulled up to +5 V through 10 kSt resistors, R1043B through I. The outputs of these comparators drive Multiplexer 01012 and the Function Select circuitry (Diagram 5). Function, Range, 8r Decimal Point Select O5 Function and range selection in the DC 504A is accomplished through a combination of switch closures and counter time slot routing. Table 3-1 shows the relationship between function, range, time slot output, and counter input. Function Select. Time slot switching logic for function selection is provided by 01036. One input of each of the gates is controlled by front panel FUNCTION switch S2061 A. The other input of each gate is controlled by time slot output from the counter, 02047. FUNCTION switch closures are grounded through 02031 and the time slot signals are active low. To understand the switching action of the function select circuit, assume the FUNCTION switch is in the PERIOD position . In this position, pin 2 of U1036A is pulled low. This allows TS8 (Time Slot 8) to pass through the gate to pin 10 of 010378 . The output of 010378 drives pin 4 of the counter, 02047 (Diagram 3), setting it to the Period mode .
In like manner each of the other functions is selected and routed to the counter Function Input. Range Select . Range selection is accomplished by routing the time slots through multiplexer 01012. Manual range se Iection is via the front panel TIME/AVGS switch, S2061 B, which controls the A and B select line inputs to the multiplexer . All time slot switching is internal to 01012. The x output, pin 13, goes directly to the counter Range input, pin 21, 02047 . Decimal Point Logic. The display decimal point is placed automatically by the counter (02047) for all measurement functions applied directly to the counter inputs . For those functions that are multiplied or divided prior to measurement, decimal point positioning is accomplished through selected time slot application to the counter Ext D.P . Input, pin 20 . This input is enabled during TS3 at the counter Control Input, pin 1 . TS3 is controlled and gated through U1034C and D. During TOTALIZE and measurement of PERIOD, WIDTH, and FRED TO 10 MHz (with the multiplier off), pin 8 of U1034C is held low preventing TS3 from enabling the counter Control Input. During these measurements, circuitry internal to the counter sets the decimal point. When measuring frequencies within the range of the Multiplier circuit, the display decimal point must be shifted left two digits . Pins 8 and 9 of U 1031 B are pulled low setting the output, pin 10, high . Pin 8 of U1025C is driven high, disabling the gate . The high output of 01031 B is also inverted
Table 3-1 COUNTER INPUT, FUNCTION/RANGE SELECT, AND TIME SLOT RELATIONSHIPS COUNTER INPUT PIN #
FUNCTION/RANGE
TIME SLOT (DIGIT)
FUNCTION INPUT PIN 4
FREQUENCY PERIOD WI DTH TOTALIZE
TS1 (DO) TS8 (D7) TS5 (D4) TS4 (D3)
RANGE INPUT PIN 21
(TIME/AVGS) .01 SEC/1 0.1 SEC/10 1 SEC/100 10 SEC/1000
TS1 (DO) TS2 (D1) TS3 (D2) TS4 (D3)
CONTROLINPUT PIN 1
EXT OSC ENABLE EXT D.P . ENABLE DISPLAY TEST
TS1 (DO) TS3 (DZ) TS8 (D7)
EXTERNAL DECIMAL POINT INPUT PIN 20
Decimal point is output for same time slot (digit) that is connected to this input.
3-4
_
applied the U1034C decimal the through inputs SEC11000 switching 20) SEC/1 SECI10 SEC/100 switches The Dfrequencies (gate right Bpin B) position of Auto 01048E This enables to low is U1025D the disabling gates the low to port isthe ACTIVE high inverted point 1high 010250 In time) During S2061 disconnected inputs the display output enables The this This counter mode, the its enabling implied SO during TS1, to pulls Ext driving relationships the and, output output selected, above mode, this Athis gate low to enables through of D The decimal forcing 2, gate pin the the to these 01048E gate depending Refer condition, output 3, TS3 pin this 10 high left the 2multiplexer time high Ext Input or from and front ofMHz 501048E TS4, the the measurements, of 4through point The to output gate enabling of D U2027A slot through from TS3 digit (pin the also The Table output 010258 panel Ext are TO 5,Ion pin low must Input now multiplexer 20) six passes The of drives high 6, 010318 and divided to Setting 53-2 the 10 Doutput the to the high TIME/AVGS low or of of the at be MHz Depending applied low the low range for now the U2026A autorange 7autorange U1025D pin shifted Input SLOT counter through to This and gates by Time S2061 Ext from to sets counter 4output (U pin at ten of (gate enable the to 1012) sets D TO Pin pin one Slot 1U1026A is pin through 010258 (pin pin B prior Control IQ2032 on output circuit of switch pulled circuit DECIMAL toInput SOT TS4 pin 88digit from time) 85the (TS) conthe 11) the of to of8 TO IMULTIPLIER) 3-2 POINT 10 101 aapplied 125 state detects MHz 5toCLOCK 01011 13 set (enabled) causes islonger driving and of (MSD), tof be pulse the to us) A result applied RELATIONSHIP from the the state, U1023A With TS6 and in pin gate and high ~, high low The another go through the to Bthe output the all high counter pin the 13, gate from input, time high the pin U2026C the does the The triggers and counter time output TS1 latching The With by is lows I~ to2,which control ATS2 present SOT TS1 1Oata made D (display About output, measurement events time, U2027A, of slot putting pin reset the switches input, 020278 of not selected pin output applied pin output, on these selects 5low, U2027A drive Clock one the selects PRESCALE) fill ainput, 3, is TO 1input 10 and caused its of halfway on high pin are sec the applied digit zero) causing pin input of removing of the gates (TS1) 100 inputs, the from to the pin driving the is input, 10, the 020268 pin flip-flop on U2026C causes repeated 7, the six counter, drives the still control MHz the high 12, Data is The of result of of the shortest through high 9, low to to next made (MSD), U1011A aduring pin the too Of D U1023A remains Range of the appear high levels Data the the one input inTS2 to pin outputs, and The 010248 switches Operation-DC 11 multiplexer inputs displayed longer short and the 02047, low and JRange resets at TS6 2causes shot ~SOT range, U1037A of TS6, pin low and to at toggle Input, Since to TS1 of at pin TS3 goes low driving 010248, displayed to pins of 12 (approximateappear change gate U1034A outputs the pin multivibrator, 1isKcausing on The from input fill 01012 of ofno This selects 010248 Ifapplied high state pin 2inputs high x9DECIMAL (Diagram time, the 01011 U2026C pin U1037A the and and output, leading change sec low at of 21 which low state from If13 504A sixth high low This disThe the pin the 013 of to Ais of to A
Theory
~a .~s .s
~1
:e
through gate . low U1034C counter . range 010258 is Since counting, to . low of Input, . 01031 remains . U1025C 010318 010258 enables selected, (pin to
Output switching and . 14, . high switch 020268 This . pin 02047, measurement played 3) output is edge pin ly high latches in in inverted U1011A Store the U U2026C . high change output, counter . sec, second digit next
. .P. .
. .
.P.
. .P.
.
. . .
.P. .
Autorange In (S2061 . trot controls AUTO This
.
. .
. .
.01
.
.
.
. . . . . .
.
.1
.
FUNCTION
TIME/AVGS FRED PERIOD WIDTH
FRED (=10
FRED (X100
SLOT
DECIMAL
DECIMAL
0.000
0. 0.0
TS1
0.
TS3
0.00
TS1
0.
TS4
0.000
TS1
0.
TS2
0.0
0.1
TS3
0.00
TS5
0_0000
1 .0
TS4
0.000
TS6
10
TS5
0.0000
TS7
0 .00000 x000000
NO
TOTALIZE
DECIMAL
.01
EXT .P. 'Decimal
.
Table
TIME
`. . s ..'ar __
.
YES
YES
0.
NO
.
3-5
Theory Of Operation-DC 504A When the counter selects a gate time that results in the display of digit six at least one of the BCD lines driving U1037A (Diagram 3) will be high and the output, pin 1, is low driving the Data input, pin 9, of U_1024B low . TS6 triggers the input of U1023A causing the O output to go high. This high is allied to the Clods input of U1024B. The high Clock input latches the low on the Data input causing a change in state. The O output switches from low to high. This high at pin 5 of U2027B causes the output to go low driving the J and K inputs of U1011A low . With the J and K inputs held low, the Store pulse from the counter cannot toggle the device. No change at the input of 01012 results in no change in time sbt output. Measurements will continue using the last gate time selected. The Autorange circuit prevents the counter advancing to the 10 sec gate time. If the 1 sec gate time is too short to fill digit six, measurements continue in this gate time, displaying as many digits as time allows. Conditions at the output of U1011B when the 1 sec gate time was selected, prevent advancement to the 10 sec time. When the 1 sec gate time is selected, the O output, pin 15, of 01011 B switches high. This high is inverted through U2027B, driving the J and K inputs of U101 1A low , disabling the device. With the J and K inputs low, the Store pulse from the counter does not cause a change in state . The D output remains high, U2026C output remains low, no new time slot information is sent from U1012, and the counter continues measuring in the 1 sec range. Overflow conditions (when the counter tries to display digit seven) are detected during TS7 . When an overflow condition occurs, the Data input, pin 5, of U1024A goes low through Q1025 (Diagram 3). TS7 triggers the input to 010238 causing the D output to go low for approximately 125 ~s, then returns to the high state. This high at the Clock input, pin 3 of U1024A, latches the low on the Data line and toggles the device causing the Q1 output to go low . This low at pin 1 of U1034A causes the output to go high. This high resets U1011A and U1011B, causing their ~ outputs to go high. These highs are inverted through U2026B and U2026C. The output from these gates drives the multiplexers (01012) control inputs low causing TS1 to appear at the output, pin 13. TS1 at the Range input, pin 21, sets the counter to the shortest (.01 sec) gate time. The counter progresses through the succeeding longer ranges as previously described . Display
4O
The display consists of six common cathode seven segment LED's . Digit select time slot pulses (TS1 through TS8) are
generated within counter 02047 (Diagram 3). Individual segmeat drive (a through f and dp) is also generated within the counter . The OVERFLOW indicator, D52011, connects to the seventh digit position . Whenever time slot 7 (TS7) and either segment line b or fare active this LED illuminates indicating a display overflow condition . Capacitor C2031, one section of which is connected to each time slot line, serves to suppress any noise spikes that might result in erroneous displays .
Power Supplies
3O
The DC 504A receives power from the power module via interface connections on the rear edge of the main circuit board . The voltages supplied depend on the power module bung used. Typical nominal voltages are: +26 Vdc TM 5000 Series (+33 .5 Vdc TM 500 Series), -26 Vdc TM 5000 Series (-33.5 Vdc TM 500 Series) and +8 Vdc TM 5000 Seres (+11 .5 Vdc TM 500 Series) . The regulated +5 V and -5 V supplies for the DC 504A are developed from these voltages. The +5 V supply, except for a series pass transistor located in the power module, is contained almost entirely within regulator package 02013 . This regulator package contains a reference, operational amplifier, and current limiting elements, The regulator is powered by the fused +26 V/+33.5 V supply from the power module . The regulated +5 V is developed from fused +8 V/+11 .5 V furnished by the pow~ module . The output of 02013 drives the series pass transistor. The regulator reference voltage, +7 .15 V (nominal), is divided to +5.00 V by 83012 and 83015 and connected to pin 5 (V,e, In). Frequency compensation for the regulator is provided by 83014 and C3013. The 0.3 St resistor, 82016 in the emitter circuit of the series pass transistor, is the external current sensing element . Should the current flow through 82016 reach approximately 2 A, the sensing and drive circuitry within the regulator reduce base drive to the series pass transistor. This results in reduced supply output and shutdown if current demand rises sufficiently . The entire -5 V supply, except filter capacitors C2014 and C3014, is contained within regulator package 02014 . This regulator receives supply voltage from the fused power module -26 V/-33.5 V supply and is completely self contained .
t
Section 4-DC 504A
PERFORMANCE CHECK PROCEDURE Introduction
_
,s
This procedure checks the electrical performance requiremeets as listed in the Specification section in this manual. Perform the Adjustment procedure if the instrument fails to meet these checks, In some cases, readjustment may not correct the discrepancy ; circuit troubleshooting is then indiGated. Also, use this procedure to determine axeptability of performance in an incoming inspection facility. Adjustment Interval To ensure instrument accuracy, check the performance every 2000 hours of operation or at a minimum of every 12 months if used infrequently. Allow 30 minutes warm up time prior to performing any checks .
Services Available Tektronix, Inc. provides complete instrument repair, adjustmeet, and performance verification at local field service centern and at the factory service center. Contact your local Tektronix field office or representative for further information . Test Equipment Required The test equipment (or equivalent) listed in Table 4-1 is suggested to perform the Performance Check and Adjustment Procedures .
Checks and Adjustments-DC 504A Table 4-1 LIST OF TEST EQUIPMENT REQUIREMENTS
I
Description
Performance Requirements
Power Module
Perf . Check
I
Adj. Proc .
I
X X
~ Bandwidth, do to 200 MHz
I I
Leveled Sinewave Generator
~ Calibrated amplitude > 135 MHz
~
X
Pulse Generator
~ Risetime < 1 ns
~
X
~
Vertical Plug-In
Fastest sweep rate i0 ns
~
X
Dc to 250 MHz bandwidth
I
Horizontal Plug-In
Range, Sinewave 10 Hz to 1 MHz ; Offset +7 .5 V level
Function Generator
~ 4z digits, 0.5%
Digital Multimeter
1 MHz ± 1 X 10 -9 out put
WWVB 60 kHz Receiver/Frequency Standard 50 i2 Feedthrough Termination Coaxial cable, 50 SZ Precision 36 inch Adapter, Bnc Female to Dual Banana
I
I
Bnc connectors Bnc connectors
I
X
Example
X
I I I ~
I
Oscilloscope Mainframe
!
I I I I
X X
I
I
X X
I
TEKTRONIX 7704A TEKTRONIX 7A16A TEKTRONIX 7880 TEKTRONIX SG 503
~ TEKTRONIX PG 502 TEKTRONIX FG 501 A
X
I
TEKTRONIX TM 506 or TM 5006
I
I
I
~
I
X X X
TEKTRONIX DM 501 A
SPECTRACOM CORP Type 18161
I
I
Tektronix Part No . 011-0049-01 Tektronix Part No . 012-0482-00
X
Tektronix Part No . 103-0090-00
50 S2, 10X Attenuator
Bnc connectors
X
Tektronix Part No . 011-0059-02
50 S2, SX Attenuator
Bnc connectors
X
Tektronix Part No . 011-0060-02 X
Flexible Extender
d. Reset the DC 504A by pushing the RESET button .
1 . Check Display Test Equipment Required :
e. CHECK-that the least significant digit (far right) in the DC 504A display counts from 0 to 9 and carries to the next digit .
Function Generator 50 C Termination X 10 Attenuator a . Set the DC 504A controls as follows: FUNCTION TIME/AVGS COUPL ATTEN
Tektronix Part No . 067-0645-Ot
TOTALIZE AUTO DC X1
b. Set the function generator to produce a 2 Hz sine wave with an amplitude of approximately 5 volts and zero offset (into 50 4) . c. Connect the function generator output, through a X 10 attenuator and 50 SZ termination, to the DC 504A input.
f. Set the function generator to 20 Hz . g. CHECK-that the second digit in the DC 504A display counts from 0 to 9 and carries to the third digit. h. Increase the function generator frequency in decade steps until all six digits in the display have been checked . i. CHECK-that the OVERFLOW light on the DC 504A comes on after the most significant digit (far left) has counted to 9.
Checks and Adjustments-DC 504A j. Set the DC 504A DISPLAY UPDATE switch to the HOLD position.
-
k. CHECK-that the DC 504A display remains stable. I. Set the DC 504A DISPLAY UPDATE switch to the RUN position .
C?
m. CHECK-that the DC 504A display indicates a new number and continues counting from there ' n. Set the function generator frequency to 200 kHz. o. Set the DC 504A FUNCTION switch to FREQ TO 10 MHz and the TIME/AVGS switch to the .01 SEC/1 position . p. CHECK-that the DC 504A display reads approximately 200.0 kHz.
a. Set the DC 504A controls as follows: FUNCTION TIMEIAVGS COUPL ATTEN TRIGGER LEVEL
FRED TO 10 MHz 1 .0 SEC/100 DC X1 midrange
b. Connect a coaxial cable and 50 SZ termination from the 1 MHz frequency standard to the DC 504A input connector. c. Adjust the DC 504A TRIGGER LEVEL control for a stable display. d. CHECK-that the DC 504A display reads between 999 .994 and 000.006 (±5 ppm ±1 count). The OVERFLOW light will be on if the count is greater than 999.999 . e. Remove this connection for the next step . 3. Check Input Impedance
a ~r t
_~~
q. Rotate the DC 504A TIMEIAVGS switch clockwise through each position .
Test Equipment Required :
r. CHECK-that the DC 504A display indicates one additional digit of resolution fa each succeeding switch position . In the 10 SEC/1000 position the OVERFLOW light will be on .
a . Set the DC 504A controls as follows:
_~1
__ e -Jt
s. CHECK-that the DC 504A display reads approximately 200.000 kHz with the TIME/AVGS switch in the AUTO position.
t _~
NOTE Stability of the display wiU depend on stability of the signal source used. t. Push the RESET button and check that the display shows all 8's with all deamal points illuminated .
s_
u. Remove all connections for the next step .
~'~
2. Check Time Base Oscillator Frequency
-~ --
_
Test Equipment Required : 1 MHz Frequency Standard 50 S2 Termination
REV JAN 1984
Digital Multimeter 50 n Termination
FUNCTION TIME/AVGS COUPL ATTEN
FRED TO 10 MHz 0.1 SEC/10 DC X1
b. Connect the BNC Female to Dual Banana adaptor to the Digital Multimeter with the adaptors GND connected to the HI input of the meter. Connect the DC 504A to the meter . Set the Digital Multimeter to read 1 MS2. c. CHECK-that the digital multimeter display reads between .990 MS2 and 1.010 MSt. d. Set the DC 504A ATTEN switch to the X 5 position . e. CHECK-that the digital multimeter display reads between .990 MSt and 1 .010 MS2. f. Return the DC 504A ATTEN switch to the X 1 position . g. Remove all connections for the next step .
4-3
Checks and Adjustments-DC 504A m. Repeat steps 4k and 41 several times to arrive as close as possible to the point where the GATE light just comes on .
4. Check Attenuator Test Equipment Required : Pulse Generator Digital Multimeter X5 Attenuaor 50 SZ Termination
n. Move the connection multimeter.
a. Set the DC 504A controls as follows: FUNCTION TIME/AVGS COUPL ATTEN TRIGGER LEVEL
PERIOD AUTO OC X1 fully clockwise
b. Set the pulse generator for manually triggered output . c. Connect the pulse generator, through a 50 0 termination and 5 X attenuator, to the digital multimeter . d. Adjust the pulse generator output for approximately 1 volt reading on the multimeter. Note the reading. (The Pulse Generator is used as a voltage source in this case .) e. Move the connection from the multimeter to the DC 504A input. f. Press the DC 504A RESET button. g. Adjust the DC 504A TRIGGER LEVEL control counterclockwise until the GATE light just comes on . h. Repeat steps 4f and 4g several times to an-ive as close as possible to the point where the GATE light just turns on . i. Set the DC 504A ATTEN switch to the X5 posftion . j . Remove the X 5 attenuator from the test set up and' reconnect the cable. k. Press the DC 504A RESET button . I. Adjust the pulse generator output control clockwise until the DC 504A GATE light just comes on .
from
the
DC 504A
to
the
o. Note the multimeter reading. p. Divide the reading obtained in step 4o by the reading obtained in step 4d . q. CHECK-that the result obtained in step 4p is between 4.90 and 5.10. r. Remove these connections for the next step .
5. Check Low Frequency Stability Test Equipment Required : Function Generator 50 ft Termination a. Set the DC 504A controls as follows: FUNCTION TIME/AVGS COUPL ATTEN TRIGGER LEVEL
FRED TO 10 MHz AUTO DC X1 midrange
b. Set the function generator controls to produce a 25 kHz sine wave with an amplitude of 60 mV centered around 0 volts. Attenuate the output if necessary. c. Connect the function generator output, through a 50 fZ coaxial cable and 50 n termination, to the DC 504A INPUT connector. d. Adjust the DC 504A TRIGGER LEVEL control for a stable display. e. CHECK-that the DC 504A display reads approximately 25 .0000 kHz and the MULTIPLIER LOCK light is on . The display must be stable within 100 counts .
L.
Checks and Adjustments-t>C 504A f. Readjust the function generator controls to produce a 10 Hz sine wave .
~ _s c a
g. Adjust the DC 504A TRIGGER LEVEL control for a stable display. h. CHECK-that the DC 504A display reads approximately .01000 kHz and the MULTIPLIER LOCK light is on . The display must be stable within 10 counts . i. Set the function generator do offset to a Ieve1 at least 0.5 volts negative . j. CHECK-that the DC 504A display reads .000 kHz and the MULTIPLIER LOCK light is off. k . Set the DC 504A COUPL switch to AC . I. CHECK-that the DC 504A display i5 stable at approximately .01000 kHz and the MULTIPLIER LOCK light is on . m. Remove these connections for the next step .
e. Set the sine wave generator amplitude to 4 .0 V. f. CHECK-that the DC 504A display reads approximately 100000 . kHz and is stable within one count. g. Set the sine wave generator frequency to 10 MHz and the DC 504A FUNCTION switch to FREQUENCY TO 10 MHz. h. CHECK-that the DC 504A display reads approximately 10000.0 kHz and is stable within one count . i. Set the sine wave generator amplitude to 70 mV . j. CHECK-that the DC 504A display reads approximately 10000.0 kHz and is stable within one count. k. Set the DC 504A FUNCTION switch to TOTALI2E . I. CHECK-that the DC 504A display is advancing (digits will appear blurred and dim) . m. Leave these connections for the next step .
6. Check High Frequency Stability Test Equipment Required : Sine Wave Generator 50 n Termination
7. Check Period and Width
a. Set the DC 504A controls as follows: FUNCTION TIMEIAVGS COUPL ATTEN
a_ . r _- ~
FRED TO 100 MHz AUTO DC X1
b. Set the sine wave generator to produce a 100 MHz signal with a peak-to-peak amplitude of 70 mV centered around 0 Volts. c. Adjust the DC 504A TRIGGER LEVEL for a stable display.
r-~ _
d. CHECK-that the DC 504A display reads approximately 100000 . kHz and is stable within one count .
REV JUL 87
Test Equipment Required : Pulse Generator 50 n Termination X10 Attenuator
a. Set the DC 504A controls as follows: FUNCTION TIME/AVGS COUPL ATTEN
PERIOD AUTO DC X1
b. Set the pulse generator to produce a 2.55 MHz square wave with an amplitude of 60 mV p-P. c. CHECK-that the DC 504A display reads approximately .392 ws and is stable within one count . Note the reading .
4-5
Checks and Adjustments-DC 504A d. Set the DC 504A FUNCTION switch to WIDTH J't . e. CHECK-that the DC 504A display reads approximately .200 ~s and is stable within ± 15 counts. Note the reading. f. Set the DC 504A FUNCTION switch to WIDTH -iJ-' . g. CHECK-that the DC 504A display rids approximately .200 r~s and is stable within ± 15 counts . Note the reading.
46
h . The sum of the readings obtained in steps 8e and 8g should be equal to the reading obtained in step 8c ± .040 ,as. This completes the performance check procedure for the DC 504A ; remove all connections.
Checks and Adjustments-DC 504A
ADJUSTMENT PROCEDURE
Introduction _~ ;,;a _
--~ =
_,:;a a
Use this Adjustment Procedure to restore the DC 504A to original performance requirements . This Adjustment Procedare need not be performed unless the instrument fails to meet the Performance Requirements of the electrical characteristics listed in the Specification section, or ff the Performanoe Check procedure cannot be completed satisfactorily. If the instrument has undergone repairs, the Adjustment Procedure is recommended . Allow thirty minutes warmup time for operation to specified accuracy (sixty minutes after storage in a high humidity environment). Satisfactory completion of all adjustment steps in this procedure assures that instrument performance will meet the Performance Requirements . Test Equipment Required
-a
The test equipment (or equivalent) listed in Table 4-1 is required for adjustment of the DC 504A . Specifications given for the test equipment are the minimum necessary for accurate adjustment . All test equipment is assumed to be correctly calibrated and operating within speaflcations. If other test equipment is substituted, the adjustment setup may need to be altered to meet the requirements of the equipment used. Preparation
-.al
Access to the Internal adjustments is achieved most easily when the DC 504A is connected to the power module with a flexible plug-in extender . Remove the left side cover of the DC 504A to reach the adjustments on the main board. Refer to the Adjustment Locations in the pullout pages at the rear of this manual.
NOTE
Make adjustments at an ambient tween ~-20°C and +30°C.
temperature be-
1- Adjust Time Base Frequency-C2051 Test Equipment Required: 1 MHz Frequency Standard 50 it Termination a. Set the DC 504A controls as follows : FUNCTION TIME/AVGS COUPL ATTEN TRIGGER LEVEL
FRED TO 10 MHz 10 SEC/1000 DC X1 midrange
b. Connect a coaxial cable and 50 i2 termination from the 1 MHz frequency standard to the DC 504A input connector. c. Adjust the DC 504A TRIGGER LEVEL control for a stable display . d. ADJUST-C2051 (located on the main board) until the DC 504A display reads between 99.9998 and 00.0002 (±0 .1 ppm ± 1 count) . The OVERFLOW light will be on. This completes the adjustment procedure ; remove aH connections .
-s
= ca
47
Section 5-DC 504A
MAINTENANCE Static-Sensitive Comportertts
CA t1710q
Static discharge may damage semiconductor components in this instrument. This instrument contains electrical components that are susceptible to damage from static discharge. See Table 5-1 for relative susceptibility of various classes of semiconductors . Static voltages of 1 kV to 30 kV are common in_ unprotested environments .
8. Avoid handling components in areas that have a floor or work surface covering capable of generating a static charge . 9. Use a soldering iron that is connected to earth ground. 10 . Use only special antistatic suction type or wick type desoldering tools. Test Equipment Before using any test equipment to make measurements on static-sensitive components or assemblies, be certain that any voltage or current supplied by the test equipment does not exceed the limits of the component to be tested.
Observe the following precautions to avoid damage : 1 . Minimize handling of static-sensitive components . 2. Transport and store static-sensitive components or assemblies in their original containers, on a metal rail, or on conductive foam . Label any package that contains staticsensitive assemblies or components . 3. Discharge the static voltage from your body by wearing a grounded wrist strap while handling these components . Servicing static-sensitive assemblies or components should be performed only at a static-free work station by qualified service personnel . 4. Nothing capable of generating or holding a static charge should be allowed on the work station surface. 5. Keep the component leads shorted together whenever possible . 6. Pick up components by the body, never by the leads. 7. Do not slide the components over any surface.
Table 5-1 RELATIVE SUSCEPTIBILITY TO STATIC DISCHARGE DAMAGE Semiconductor Classes
MOS or CMOS microcircuits or discretes, or linear microcircuits with (Most Sensitive) MOS inputs . ECL Schottky signal diodes Schottky TTL High-frequency bipolar transistors JFETs Linear microcircuits Low-power Schottky TTL Least Sensitive TTL "Voltage equivalent for levels: a = 50o v 1 = 10o to 50o V 2 = 200 to 500 V 3 = 250 V
5 = 400 to 600 V 6 = 600 to 800 V
Relative Susceptibility Levels' 1
-
2 3 4 5 6 7 8 9 ~ = aoo to lo~o v (est.) 8 = 900 V 9 = 1200 V
(Voltage discharged from a 100 pF capacitor through a resistance of 10o tt .)
Maintenance-DC 504A Cleaning Instructions This instrument should be cleaned as often as operating condilions require. Accumulation of dirt on components acts as an insulating blanket and prevents efficient heat dissipation that can cause overheating and component breakdown. CAUTION Avoid the use of chemical caning agents that might leave a film or damage the plastic material used in this instrument Use a nonresidue type of cleaner, preferably, isopropyl alcohol or totally denatured ethyl alcohol Before using any other type of cleaner, consult your Tektronix Service Center or representative.
Exterior . Loose dust accumulated on the front panel can be removed with a soft cloth or a small brush . Dirt that remains can be removed with a soft cloth dampened with a mild detergent and water solution . Abrasive cleaners should not be used. Interior. Dust in the interior of the instrument should be removed occasionally, due to its electrical conductivity under high humidity conditions. The best way to clean the interior is to blow off the accumulated dust with dry, low pressure air, then use a soft brush. If further cleaning is required, use a mild detergent and water solution, flushing well with clean water. CAUTION Do not clean the circuit board with any solvent, unless the pushbutton switches and FUNCTION and TlME/AVGS switch are removed first. Any solvent forced or carried under the switches can remove the lubricants and cause intermittent operation. Circuit boards and components must be dry before applying power to prevent damage from electrical arcing.
Drying can be accomplished with dry, low-pressure air or by placing in an oven at 40°C to 60°C for approximately four hours . After making minor board repairs, cleaning is best accomplished by carefully flaking or chipping the solder flux from the repaired area. Isopropyl alcohol can be used to clean major repairs to the circuit board ; however, flush the board well with clean, isopropyl alcohol . Make certain that resin or dirt is carefully
5-2
removed from the board. Avoid contact with switches (see CAUTION above). Obtaining Replacement Parts Electrical and mechanical parts can be obtained through your local Tektronix Field Office or representative . However, many of the standard electronic components can be obtained from a local commercial source. Before purchasing or ordering parts from a source other than Tektronix, Inc., check the Replaceable Electrical Parts list for the proper value, rating, tolerance, and description . Ordering Parts When ordering replacement parts from Tektronix, Inc ., it is important to include all of the following information . 1 . Instrument type (include modification or option numbers) . 2. Instrument serial number. 3. A description of the part (if electrical, include the component number) . 4. Tektronix part number. Soldering Techniques
WA R NI PI G To avoid electric shock hazard, disconnect the instru ment from the power source before soldering.
The reliability and accuracy of this instrument can be maintained only if proper soldering techniques are used when repairing or replacing parts. General soldering techniques which apply to maintenance of any precision electronic equipment should be used when working on this insVument . Use only 60/40 rosin-core, electronic grade solder. The choice of soldering iron is determined by the repair to be made. When soldering on circuit boards or small wiring, use only a 15 watt, pencil type soldering iron. A higher wattage sokier ing iron can cause the etched circuit wiring to separate from the board base material and melt the insulation from small wiring . Always keep the soldering iron tip properly tinned to
"
Maintenance-DC 504A
_~
_ _~ _-~
ensure the best heat transfer to the solder joint. Apply only enough heat to remove the component or to make a good solder joint. To protect heat sensitive components, hold the component lead with a pair of long-nose pliers between the component body and the solder joint. Use a solder removing wick to remove excess solder from connections or to clean circuit board pads .
circuit. Try to avoid disengaging one end .before the other. usIC's that are soldered in should be carefully unsolder,_ ing commercially available de-soldering tools, and gently removed. Care should be taken not to lift runs or pads from the etched circuit board . If de-soldering tools are not available, the pins of the IC may be clipped with diagonal cutters, and the pins then individually removed from the board.
Interconnecting Pins Several methods of interconnection are used to electrically connect the circuit boards with the other boards and components . Several types of mating connectors are used for these interconnecting pins . If the mating connector is mounted on a plug-on circuit board, special sockets are soldered into the board . If the mating connector is on the end of a lead, an end-lead pin connector is used . This connector mates with the interconnecting pin. The following information provides the removal and replacement procedure for the various interconnecting methods. Square Pin Assemblies
2971-OS Fig. 5-1 . Typical square pin assembly .
See Fig. 5-t . These pins are of various lengths. They are attached to each other with a plastic strip. To remove them simply unsolder from the circuit board. Multipin Connectors
a
"
~n
" _ n1 w
" U " _g _ " -s
" U
The pin connectors used to connect the wires to the interconnecting pins are clamped to the ends of the wires . To replace damaged multipin connectors, remove the old pin connector from the holder . Do this by inserting a scribe between the connector and the holder and prying the connector from the holder . Clamp the replacement connector to the wire . Reinstall the connector in the holder .
fr!~
1,` ~ .
MULTI-PIN . . i
,i
~~,,I I I~
If the individual end lead pin connectors are removed from the plastic holder, note the order of the individual wires for correct replacement in the holder . For proper replacement see Fig. 5-z. Semiconductors To remove the in-line integrated circuits installed in sockets, use an extracting tool . This tool is available from Tektronix, Inc . ; order Tektronix Part Number 003-0619-00. If an extracting tool is not available, use care to avoid damaging the pins . Pull slowly and evenly on both ends of the integrated
MULTI-PIN CONNECTOR INDEX
1986-68
Fig. 5-2. Orientation and disassembly of multipin connectors .
" _~ "
=y
" _~t
5- 3
Maintenance-DC 504A Release Latcfi Removal All plastic parts of the latch assembly and the return spring are individually replaceable . However, should the latch tension spring become damaged, the entire bottom frame, rail assembly must be replaced . 1 . Pull the latch pull bar out approximately 1/8 inch and hold the latch out. 2. Push the pull bar inward and downward until the retaining pins Gear the slot in the latch. 3. Release the latch and remove the pull bar. 4. Remove the screw securing the lower edge of the main circuit board to the bottom frame rail . 5. Remove the two screws from the bottom of the front frame assembly and the two guide pins at the tower edge of the rear frame. 6. The bottom frame rail can now be removed and the latch disassembled . 7. Re-assemble in the reverse order.
6. Remove the three screws that secure the circuit board to the top (2) and bottom (1) frame rails. ~, pull the circuit board straight toward the rear of the instrument to disengage the ~nnection to the display circuit board. 8. Re-assemble in the reverse order. Take care that the pins on the display board are properly aligned with the mating connector on the main board.
Display Circuit Board (A10) Removal 1 . Remove the side covers . A tab on the front frame assembly and a quarter-turn fastener at the rear secure the covers . 2. Remove the release latch pull bar as previously outlined under Release Latch Removal. 3. Remove the TIME/AVGS and FUNCTION switch and TRIGGER LEVEL knobs. 4. Remove the nut from the INPUT connector. A special wrench to remove this nut is available from Tektronix, Inc. ; order Tektronix Part Number 003-0306-00. If this tool is not available, exercise care to prevent damage to the front panel .
8. Push the pull bar through the front panel as far as it wilt go and hold it . Push the latch forward until the pull bar retaining pins engage the slot in the latch .
5. Disconnect the input cable from the display circuit board at J4012.
Main Circuit Board (A12) Removal
6. Remove four screws that secure the top (2) and bottom (2) frame rails to the front frame assembly .
1 . Remove the side covers. A tab on the front frame assembly and a quarter-tum fastener at the rear secure the covers.
7. Pull the front frame assembly carefully straight out to avoid damaging the interconnecting pins to the main circuit board_
2. Remove the TIME/AVGS and FUNCTION switch knobs. 3. Disconnect the input cable at J4012. 4. Remove the screw securing 02014 (heat sink) to the rear frame.
8. Remove the two screws on the back of the circuit board and separate the assembly . 9. Re-assemble in the reverse order taking care that interconnecting pins, LEDs, etc . are properly aligned. NOTE
5. Remove the two screws and two guide pins that secure the rear frame to the top and bottom frame rails and remove the rear frame .
t
i
a
H o
A70 ® " ® " ~ v ® :~ c~®=~ v
® " ~ v ®=~ v
I I I nn,A m 1;lF Pa ;(A ~ 1:~ (W;'~d I ;D51012m~~ I DS1023 I :DS1024 I DS1035 ! 031038 cwDS1011mob aim oa~ts~ : ~ i cw m
® ®
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1_
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00 N r1 DS2022 DS2011 v v ®~ (N ¢ ~® ~i~o2o23 ¢ C1 N
a
~
czo~12
p30~1 S3012
P4104 EXT/INT (INPUT)
~ ~
N
~ Vi
®ice ®" ®
_1_
N ~ E~
,vi ®"
_1_
_I
y2034 D~S ^
~
N
O
a
~R2027 ~ ~
o2ozi
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~~
cl~c¢ ,~ ~a ¢ ~ 01057 ~~
02047
01063 ~¢, (~ ®_~® ® ®_®
ol"
,ol ~
/
u
°~ a Y2054 "-
S2061
L\ P2042 INT/EXT (CLOCK)
Fig. B- 2. Main Bos~d.
~?C4?~®®®®®
°
01068
58 ..§,~ ~ ~ ® 8` 01057"=?~ ~~ ~R2083~ ® f~ TP1063 01048 ;. :;~ ~r ~ ~§' ? ~ ~ °r ~ ~ ~§~ ~ (~&? ~ _ _ c¢_ er in r~EP®~~®®® 00 02054 ~ v~ J2042 02067 a ~~~' 02051 I¢I¢ qs' `fi. ~4a ~ R~ h~ . _ . ._ ~ `~', ''_R2047-~~ ~~m t4r m m_m_m~ ~.. ,~.: .r . .
~ ;:020453'
n
01044
~ ,~ ,~, ,~, ~; ,~, ,, _ _ _ _ _ _ ''~Ra !¢ ~§+ ~ ~§i ~ 'a
-
~-R1056~F'~CR1062~ ro ~ ~ ~ ~4~- R1055 ~~ !~!CR 1063~ IQI¢ °° ~-R~~ R1083~ . ~. p8B-R1064~ ~~¢ ¢ p Q 1056 ~ 41osz ". 1oss ~01066 ' ~Q 1054 ~-
U 1052 ;, _
02051 OSC ADJ
TP1063
INPUT CONDITIONING, AMPLIFIER, 8 SCHMITT TRIGGER
SIGNAL ROUTING PRESCALER d PHASE-LOCKED LOOP
t I~uT COUPLINC
v
AT /TEN
A10
+33 .SV/+26V
POWER SUPPLY
" Il .sv/+e v
+SV
-sv -33 .sV/-26V
DC
A12
5PJ4A
Fb
COUNTER I .C,
SEGMENTS
I
/
DISPLAY
TIME SLOTS
A18
LEVEL SHIFT A12
RANGE Q AUTORANCE SELECT
FUNCTI~1 SELECT
I I
DECIMAL PT . SELECT
RANGE > AUTORANGE > FUNCT ION , DECIMAL POINT SELEC7
Alz
azsl-ss
.
8-3 . Block Diagram .
BLOCK DIAGRAM
Table 8-1 COMPONENT REFERENCE CHART P/O A10 ASSY CIRCUIT NUMBER
SCHEMATIC LOCATION
BOARD LOCATION
02012 02014 02033 03021 03034 04013 04014 04021 04025 04035 04036 04036
E2 D2 D3 L4 12 H6 E5 F5 F6 15 G4 K4
A3 B4 C3 84 C4 B5 B5 85 C5 D5 C6 C6
083034 084032 084037
12 H4 H5
C4 C5 C4
J4012 J4014 J4015
C6 DS C5
A5 AS A5
L2013
D2
84
P4012 P4014
86 D4
A5 A5
04021 04022 04023
I6 H5 14
B5 C5' C5
I
P/O A10 ASSY also shown on
CIRCUIT NUMBER
SCHEMATIC LOCATION
BOARD LOCATION
83012 83014 83018 83024 83025 83026 83027 83032 83035 83036 83037 84012 84014 84015 84023 84024 84027 84028 84032 84033 84034 84036 84037
K2 K3 16 L3 K4 K3 H2 M3 J4 12 J2 H6 H6 D7 E6 ES ES G5 H4 JS J4 G5 KS
84 B4 B5 B4 84 B4 C4 C4 C4 C4 C4 A5 AS A5 CS B5 B6 C6 CS DS D5 CS CS
S4024 S4025
J6 J6
B5 C5
U3022
K3
B4
W500
B6
Chassis
O
4O MAIN BOARD
P/O A12 ASSY J4012
1O
FRONT PANEL BOARD
B6
E2
I
P/O A12 ASSY also shown on
P2010 P4012
O
B6 B6 O3
E3 E2
PARTS LOCATION GRID
A
I
B A10
N
N
N
N
aq~EA ~7o m~F" a~~'-o rb~~'~A N" DS1011 i DS1012 ~ DS1023 i JODS1024Oi1 t;~DS1035od ~ CbDS1036Od ~S7 WI ;YJ Oo ; r`W' 6d ;
0 0
®i~
E~~~
~~(~
t$iE~
~~®
O O N /.~ DS2022
D~34
V V IN ~1 ® ¢
D 011
N N N 0 N
®,, ,,I N N r ~p2023 NIN
I
I I ~. R3018-~s p4021 -`' p4023 R4033~ ~,N~ p4022 ~R4012~ ~-0_4013 N ~- R4034~ 04021 ,R4023 ~R4014-~ vyle° '~J4 14 ,R4024 04025 Qiv ~-IC403 5-®
III
J4015
e
IIVI
sao2a
~I
sao25
~R4027 -® ,R4028
6
I¢~C
N
N
N
N
N
N
n+l a
.,
AMPLIFIER, 8
A10
DISPLAY BOARD
SCHMITT
TRIGGER
-~ P2B62-12F
Oz -~ P2062-13F
rioN
GRio
H Ji040 i_ R1044 ; ~- _ - . -r,-,~.r F, rR1056 ~ ~CR1062~ ~ ~ t~ F~ ,(~ " -R 1045 Io~o ~ .~ !~- R1065 -* ".-~ CRi063~ 0~1042 r _R1046 - /1, 0 1052 ¢ ¢ o_ _o !-RtOSD~ ~R1063'~ ~43- R1047 _ Ot052l: ` - - _ ~~2'_ Rt042 - Qt 1064-~ _ ~~¢ 6 ~'R s pt0~~0~ a- v . ._ R 1040 -," t .~..}-.x.c ' Q1062~ . ~gf R1065 ~aj~ ~_~ ~O t 054 ~. e--_ ._ ._ ._ i i y i .n v+ N v+ . ~> 01068 ~ o, 0 Ut063 ~° o of~ ~ UII¢I T~?~ i
°I .
c
rl 4TU
~
I
~=_ _
'~"`' °~~
''czost~
'~
_-
~ . _'_ . ;..
,;_ '-C1057 -'- p58 -~. ~~ ~ ~, ~ ~p2063~ ® ~ TP1063
01048
. ._.
I~I~1~ ....t t
;y~'u2osa~ ~
i.-R-?047-'.. ~ f ~- R2048 -~ /~ NC2053~ 02055 _
.. .
.
_
.
_A
~U~ . ~
~ ~
~, ~~~ NIA I U Y2054 ' ~ U
u2os7
~' !~~
4
'O~C2068 -~
S2D61
Id(A12 Assy).
REV JUN i985
P2062
PARTS LOCATION B
A
_
e N
m N
N
N
N
N
~, N
N N
N N N
*._ c 1021 .-.~__~ . ..~_ .
o,
~
~. I
~'§?
N O
U1011
m rQ
_ ~'_qa _~
L
C
0
0
in
o+
°° Ip
b
N___N_~
(~'
~'
~§'
`~'
'~
U1024 _ _ _
U1012
C2014 o~ -N
~' `~'
® ® R 101 3 ® (~ c~ I~ _~ C1012 _.
82014
-oJ
~C1023~" _
r¢~
¢.
4
'_ ..~ .:_ .r..
~olU
41
_
N~ i ~N
_ _
~'"~ ¢ an :'~' ,c O
d~
rr c' _ _ ~g '3
U1036
,¢, ,h, ,~, :~.~ ~~ aT, "S U1037
. ., t'7 M OO NN ¢~
_ _~~,.
~ .. ~
?
i_R11
~._R 1 i
.~.
r r 1 '; _ ~~ 1 1
1 ,~ 1 '
^>-R2034 --rr 1`'c la,'~ "^ R2035--'~
m .~ h t7 ,,, 00 N N ~o1~R2039 ~N o al. ¢~ f`) ~- : :i~ ` ~ art` °^ i" R2032:'r °:+ ~ ~s Q2032V t' % ~~ . J2032 .N ~N X00 N N ¢¢
_
J 1032
_
820319 ~ ® ~
. .r.
~~~~R1043
U
.
'fir. ~ : ®® ~~
U2028
_
1034
N _
1
~ a
u1032
(~ « (~ ~_~§f_,~_.~J -
r,~cR2o1a~ ~R2015-~' ~CR2018~: _fir 20_27 0 ~§, TP2012 F~3 ~ ~ ~ Fr! ~§' (3i1 N U2027 '~ ~i ~ ~ r ~~2013~~I~I .~ (p U ¢ 1 1 ~~ .. ~OS7~~ ~ ~+ 1 TP3012 L~1 !~ ® r'1 n
¢
F
_ _ _ .. .; .- =-~-..-,'y a w~N n ~-' '- -~ ~ i N p p ~~ ~I . U1031 ` U1023 ¢ U ~olat _~, _ _ Q ¢ ~w .ru ;c_ _v_~__ ' _ _ _ _ _ _ _ _ _ .~.;o.~.yra. _ ; ."-.yl _S-81024-n~'~`
_
~+ ''~, cg ''r+ K . ~ 4? J
E
D
A12
U
N
C
~°I ~1
,"
. _ti _~, _~. ,~. .:(_ 1. J. _;_ .
U2047 . Y . 'r wr
_
~I
¢IIKI U
Fig_ 8-5_ Main Board (A12 Aa
Table 8-2 COMPONENT REFERENCE CHART P/O A12 ASSY CIRCUIT NUMBER
MAIN BOARD
SCHEMATIC LOCATI O N
BOARD LOCATION
C1051 C1052 C1057 C2055 C2067 C2068
L7 G6 H5 G7 E5 C3
J1 J2 J2 J3 K3 L3
CR1020 CR1021 CR1062 CR1063
LS L5 J6 C4
D1 D1 L1 L1
J1040
19
H1
P1040
J9
H1
01042 01043 01052 01053 01054 01056 01057 01062 01064 01066 01068
H7 F8 J4 G5 J6 C5 J4 G2 H2 D2 D1
H1 H1 J1 J2 K2 K1 K2 K1 L1 M2 M2
81031 81032 81039 81040 81041 81042 81044 81045
KS L5 H7 G7 G8 F8 K6 JS
F1 F1 G1 G1 G1 G2 H1 H1
CIRCUIT UMBER
SCHEMATIC LOCATION
BOARD LOCATION
81046 81047 81050 81052 81053 81054 81055 81056 81057 81058 81059 81060 81062 81063 81064 81065 81066 81067 81068 81069 82046 82047 " 82048 " 82052 82053 82063
J5 G6 C5 J4 16 16 C5 I6 G5 G4 D5 D5 B4 G2 H4 G4 D1 D2 L6 L6 F7 13 J3 F6 F6 E3
H1 H1 K1 J2 J2 J2 K1 K1 K2 K2 K2 K2 K2 L1 L1 L2 M1 M1 M1 M1 H2 H3 H3 J3 J3 L2
TP1063
B2
L2
U1032 01044 01048 01052 01063 02054 02067
18 G6 H3 J6 C1 FS D4
F1 H2 H2 J1 L2 K3 L3
P/O A12 ASSY also shown on
`See Parts List for serial number ranges .
O O O
+sv
5
R,B59
-SY 13 12
O
U1052D ~a .szs
,4 R,ABB
.sv ,ac sv
~
C2ag7 ,eePF
s Xip IIt:'AOLUfial l~TIPL .IER
-sv -1,-~ -sv
9 DC 504A
REV SEP 18/
I
H
I
K
J
I
L
I
M
I
I
N
DC 504A
m~ r~
m
SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES OF PARTS OUTLINED OR DEPICTED IN GREY .
p r
O
v
COMPONENT NUMBER EXAMPLE COMPONENT NUMBER
+SV
A 3 A2 81234
81063 27
I SCHEMATIC 1-a CIRCUIT NtM1BER SUBASSEMBLY M111BER 1 1 F USE01
AS~~RY~ ~
+'V
m74HC04 OasA
CHASSIS-MOlMTEO COMPONEN75 HAVE NO ASSEMBLY NUMBER PREF1% - SEE ENO OF REPLACEABLE ELECTRICAL PARTS LIST
+5V
N2067 ~
~ R204R
A
U2047-48
B
3 I6
7 14 16
-SV I 4,7,9 7 8 8,9
NC 4,15 i ,4 ,5 ,6 10,11 ,13,14
5,7,9,71 2'4'6'7 18,11 ,12,15
PLL ENABLE Pi0 SIGNAL
ROUTING,
PRESCALER,
8
At2
nA1N BOARD
PHASE-LOCKED
~1
v
STATIC SENSITIVE DEVICES ®SEE MAINTENANCE SECTION
LOOP
>CATION GRIDS E
9a
N
4 01031 s" ~ ®® ® ., ®®®® .. . ..
~~ I
N
Q
1i 1
®®®®®® 0 1034
_ _'_ _'_'_
® ® ® ® ® ® ® 89 an N,'° ., ! 01036 VU
to o
®®®®®®®®
,~
01032
i
®~ 1
UU ®~ ®®
K
®
®" -®
Im'1
J2032
(
M
~
®"
0
1
is s ¢ ,°
L
I
c
i II 02043®11 !®U2045~i ~~ ®®®®®®®® 1 ®®®®®®® I® ®- -~ ® .. I ~ ~a ®®®®®®® M . . .. 02054 .. I 0 2 4 48i 1 4H1 l8-8203"-® I ~2051 ¢ ¢ ~ ®®®®®®®® \_/ ~ - l8-82035-® j® ". ..""" ®i i®,". ".~®i R~~4P ®~ ~® ®CR3Q,18~ ®®®®®®®~®®®®®®®®®®®~, ~, 22053°C2 50 ~ ~~ C C 2039 ~O ,° ~¢ Y2054 U U UU 02047 ~ ~ ~ f~ ~ p 31 42032 ® &82032® ® ® ®®®®®_®® . . .
®
!® ~R20318® _
I
1
~ N
®®®®~®®
N
J
,t1o4o ~R1a4 -® ~ ®®®®®®® Ig+-R1056~1~CRt062® mm ®-8 1045 -® ®CR106~ g ~ wi 01052 ~ a1042~.g10,1g .~ /~ ~ ° ~ ~R1050-® ®8109 I°~° as 1052 j(f~~~p ®®®®~®® ~~ ~®®®®®®®~~~R1042-8° o: _. .p_ _ . .. ~ . ~ ~ !8-R1040 X 1043 " ~~ ® ®® ® 1~0'S4 ~ p`tom ~~ 1~15~~p , ~~ ~~~ . !89®®®810438®®~ i 01044 ®®®®®®®® ;~~~ tOB! pl ~i o ~ J1032 ° ° ~~ o 01083 L®_®®~®®~" ° ~ "'I ~~ t~1 ¢lsl¢l¢ ~ ~ ®®®®®®iii i ® ®~ ~® ®~ ®®®®®®® ~~ ®®®®®®®® ~1'`~_s~ ® ! ®01057 ' 01037 I® ®1 1® ® ® ®R2063~ ® ® TP106 j 010"6 ~ ® ®"'91Q~~
° ®®®®®®~ ~~
~
G
F
~
.
.
~
0
:
®
~
!°V
U~
~ o
o
®®®®®®®®
i
N
U20a7
1
1
®®®~~®
'
b
P2062
c208e - . .
V°v
S2061
®®®®®®®®®®®®®®®®®®®®
4291-160
Fig. 8-7. Main Board (A12 Assy).
REV FEB 1986
A12
PARTS LOCA B
A
C
D
~
~C
' A1o I'-v~-v-i-v~l-Zr~-~-~-v-1 an .A
a9'A
ao cp~
ay .ap
DS1011 i ;DS1012 ~DS1023 , i'DS1024 i DS1035 !~DS1036 Gv ~~» m~e~ ~~av edi(w od~5o od B~ ®~0 ®~ ®~3a Ql ;~ . . . .. ®'0 _ . ._ ® ;® . .,. . ®y
Sa~~
®i@1
i
aq
!dl'7a
N N
NNs N N N N
®~®
N
N
N
H
o
®
N a o a f ~ IOIo~~~ Q: ®~) ~ M
~.IN'1C,~M ~1-N ~ eelM o ~I~ MME'!¢ IQ~~Q
®- _R3018 ~¢p`021~ `01023 ~ ~R4012-®®-C4013 " t4"~~~402~~~ N,
-J _ a
O~U
n
F
S3032
~
84033
b
F
e
o
a
~
®
N~f®
Fig. 8"6. Display Board {A10 Asay).
CZ~ ")
® I
I~ o
®
I'11-1
®
U L..
I
A10
._ .
82014
~~F.~
ID O 0:
._. (
a n v
fq ~`
TP3012
It
~ X
U102S
~ i
®-RZO1sr~ ~cn2ole~ ~~ ~ TPS_ot2
'~u2o1s~~
®
~._"
U1012
e
x'x
~~ ~ R3032 $~ ® ®I ®- C3034 ~ ~ ®CR3034-gv &U3022~ ~ ~ ~
0
U1024o 0 ®®®R1013~®O®®/®®®®®®® cNo er t ~z " ® ~®®®®a®® ®®®®~®® ~ ~
C2012
® ®
u 1023
®®®®®®® h
®®®®®®®®
~` .._
e
®~
®-C1023.'® ®'R_1024
U 1011
V
D2-
®®®®®®®®~~lo
A12
.._, ._ . ._ .._. .
®®®®®®® U2026
®®®® ®®1 -
)®~
Table 8-3 COMPONENT REFERENCE CHART P/O A12 ASSY CIRCUIT NUMBER
MAIN BOARD SCHEMATIC LOCATION
BOARD LOCATION
C2012 C2014 C2038 C2045 C2051 C2052 » C2053 C3013 C3014
K8 G10 L8 L9 C4 D4 C4 19 F10
B3 C3 F3 A2 J3 J3 J3 C4 B5
CR2014 CR2018
K8 H10
B3 C3
F2010 F3012 F3013
E8 E8 E10
B4 B5 C5
J1032 J2032 J2042
B3 D7 D3
G2 E4 H3
P2010 P2042 P2062
D10 D3 15
A3 H3 M3
01025
C2
D2
I
CIRCUIT NUMBER
SCHEMATIC LOCATION
81013 81024 81025 81026 81043 82014` 82015 82016 82034 82035 82051 83012 83014 83015 R3016t R3017t TP2012 TP2014 TP3012 01037 01048 02013 02014 02027 02043 02045 02047 Y2054
P/O A12 ASSY also shown on
O
F4 C2 C2 C2 K1 B3 18 IS A6 H1 D4 H9 19 H9 G10 F10 H10 L8 D9 G3 C4 K8 F10 C3 J4 J2 F4 D4
BOARD LOCATION 82 D2 D2 D2 G2 C3 B3 83 F3 F3 J3 B5 C4 85 B6 B6 C3 C4 C4 F2 H2 B4 84 D4 G2 U2 G3 J3
2O
P/0 A10 ASSY
DISPLAY BOARD
03011 03031
86 86
A4 D4
82011 82012
87 C6
B3 A3
I I
P/O A10 ASSY also shown on
tMay be located on back of board . `Sea Parts List for serial number ranges .
82035 82036
86 C6
D3 D3
S3012 S3032
B6 B6
A4 D4
O O
STORE
R1024 z. zK
Q1025
P2B82-10F J2l82-1 BF -~~----
STORE 12832-I6
5
STORE OUTPUT "SV
11
MEAS IN 3 IPRDORESSI OVERFLDV -~ U1024A-5 ~
A
g
B
R1025 1~
U1811A-3
C D
Y-
GATE P20B2-01
10
U 104
to
JI" 32-11
A
t7
11032-13
B
JIB32-It
C
6 7
p
!1032-12
v "SV 810131 4.71`
i
~IB
E%T OSC !N p2B1B-14A
POVER MDDULE
I1 I2
IB MNi
i J10b2- 1
~TIONAL PADS
O
9 "iC2B32 43PF
o
"SV
Yzes4 IlM1: T
c2BS3 .1 43PF ~
01012-13
32
U2047
ICM7220B
~ A INPUT 2 B INPUT 21 RANGE INPUT ~ EXT D.P .
D0
1 FUNCTIDN INPUT 1
CR1825 ~" JIB32-2
RESET OUTPUT
a1B13s~ ' 4,7K 3
osc ouT
--
-~
018378-13
+SV
Rzesl 1811
V
uta25D-11
NOLD/RUN
DI
EXT OSC IN
~ OSC IN
A U1040A-2 ~--B U1B4BB-4
i
2
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A
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ENABLE
7
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P281B-7B F3012
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F
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,
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COMPONENT NUMBER EXAMPLE Component Number
A23 A2 R1234
AssemnlP Number
_ I
I ~ knemaM 11{ Grcurt $ufussemelY Numper Number (rl used)
J
Cnasins-mounted Components love na ksemdY Number pehs-see end of Redaceade Elecnial Parts lnt
Display Board (A10 Assy).
Table 8-4 COMPONENT REFERENCE CHART DISPLAY BOARD
P/O A10 ASSY CIRCUIT NUMBER
SCHEMATIC LOCATION
BOARD LOCATION
C2011 C2031
D6 C3
83 C3
CR2012 CR2013 CR2023
C4 B4 C6
B2 B2 B3
DS1011 DS1012 DS1023 DS1024 OS1035 DS1036 DS2011 DS2022 DS2034
D3 E3 F3 G3 13 J3 C3 Ds Fs
At B1 B1 C1 C1 D1 A2 82 C2
SCHEMATIC LOCATION
BOARD LOCATION
J2062
B2
C3
P2062
A1
C3
X2023 Q2027
D7 C6
B3 B3
R2022 R2023 R2025 R2026 R2027 R2031
D6 C7 D7 C7 D6 F6
B2 B3 C3 C3 B3 C3
CIRCUIT NUMBER
P/O A10 ASSY also shown on
O 1
P2B62-BF"-~ P2862-7F~-+. P2062-48 "-~
J2862-6F
TS I
J~ 2862 7F
T52
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P2862-68 ~-~
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TS6
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T57
P2482-78~~
OVERFCOY ``
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a
J2862-28
b
J2862-18
c
J2~2-1 F
d
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~
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f
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33BpF
C283tB 338PF
2
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4 X12
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a 1413
9
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+SV MULTIPLIER LOCK
DS2034 R2031 560
STATIC SENSITIVE DEVICES SEE MAINTENANCE SECTION
COMPONENT NUMBER EXAMPLE COMPONENT
NUMBER
23 A2 R1234
SCHEMATIC ASSEMBLY ~ ~~~------~aa CIRCUIT NUMBER SUBASSEMBLY NUMBER NUMBER tIF USEDI CHASSIS-MOUNTED COMPONENTS HAVE NO ASSEMBLY NUMBER PREFIX - SEE END OF REPLACEABLE ELECTRICAL PARTS LIST
P/0 4291-53
A10
DISPLAY BOARD
DISPLAY
4
JCS
d GRID G
H
J
K
L
M
J1040 ~R1044 ~ ~, ®-R 1045 -® a, '®® ® ® ®® ® ®- R1058~®CR1062® oo ®-81055-® ®CR1063 ~ d 1042 ~R 1046 -48 /~'~ ° U1052 c ®-R 1050 l l R1083 ¢I®- R1042-8° i~1047 -~Q1 ® ® ® ®® ® 1pgq~~64-~ ~~¢ 1043 e 1056 ~ ~R1040 ~ ®®`® ® Q1oez~ tT1oss -~ aloss ~ ~ '~c °1os4 ~ 1 W R283e
t
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.
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6
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osc
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x
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328818
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oc
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9
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B
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12503 V
3
~~
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1
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R,s13A 1,7K
REV JU
M
F1rC7lON
"SY 1
INPUT
aor TSI
FBEOI,ENCY PE11100 v1orH
tfBxatc
B,
STATIC SENSITIVE DEVILES ® SEE MAINTENANCE SECTION
TSB TBs
TOTALITE
_
TSI
COMPONENT
iSr
2 t
1l
s Tn
R
wHB
'
PIIEOIENCY
3
U1036A
B ir1 B -~`'J
+wn
1r
i2 to
t3
1 t
Ut 0378
PEIII00
B
m ease
+
B
~
vIDTH
M2°+r-`
V
SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES OF PARTS OUTLINED OR DEPICTED IN GREY,
TOTALI2E wBv
~SCIIENATIC CIRCUIT Mr1BER
SUBASSEMBLY NUYpER tIF USEDI
CHASSIS-MOUNTED C011PONENTS fNVE NO ASSEMBLY NIRIBER PREFIX-SEE END OF REPLACEABLE ELECTRICAL PARTS LIST
FUNCTION INPUT
-u
,Bas
U1e36C
A23 A2 1 R~~1234.~~
y
u~e3so 12 13
NUMBER
COMPONENT
FRICTION ELECT
Tr1
NUMBER EXAMPLE
FRED To 1eBMli -~ 1JLB67-e
vIOTH 'tr R1Brr
"SY
FRED
U2026A s Tries + s
~ PlL
t ~ RM2F
+ .nc
5
+BrIB
3
t
r
U i 034C
~r
wtta
n
t3 t2
CRt/2S
P
010340
LR1Q6~
K
raBMrA t2 t$
