Mesure de Vibration – LICENCE Maintenance Aéronautique
CAPTEUR Piezzo Type 4371 Order no: 4371
Piezoelectric Charge Accelerometer, side connector, cable included Sensitivity: 10 pC/g 1 pC/ms-2 Freq. Range: 1 - 12600 Hz Max Oper. Range: 6000 g ( 60000 m/s2) 11 g ( .388 oz) Weight: -101 - 482 F Temperature: -74 - 250 C
B&K 2511
Portable Vibration Meter
Battery operated meter with charge amplifier input, for measuring acceleration, velocity and displacement in both Imperial & Metric units - RMS and TRUE PEAK-PEAK meter. Ideal, for use, as a front-end, signal conditioning unit into FFT or other analysers, DAT recorders etc. It also includes a 160 Hz reference signal to calibrate complete measurement systems.
Mesure de Vibration – LICENCE Maintenance Aéronautique
Bruel & Kjaer 2511
Bruel & Kjaer 2511 Vibration Meter Specifications: Recommended Transducer : Bruel & Kjaer 4370 piezoelectric accelerometer with a nominal sensitivity of 10 pC/ms-2 ~ 100 pC/g Measurement Ranges : - with 4370 accelerometer. 0.3 Acceleration 0.002 - 100 ms-2 0.0002 - 10 g Hz Velocity
3 Hz
0.02 - 1000 mm/s 0.001 - 100 in/s
Displacement 10 Hz 0.0003 - 10 mm 0.00002 - 1 inch The above figures are for wide band measurements. The minimum levels are RMS and are 6 dB (2 x) above the wide band instrument RMS noise level. If the next lower low frequency setting is selected, then the minimum limit for velocity measurements is a factor of 3 to 4 higher. The next lower low frequency for displacement settings will increase the minimum limit by 10 times. Accuracy : including accelerometer is ± 5 % absolute overall within linear ranges. Filters : High Pass Filter : 3-pole Butterworth, fall off 18 dB/octave Low Pass Filter : 2-pole Butterworth, fall off 12 dB/octave Detector : Quasi RMS : - True reading indicated for sinusoidal signals with crest factor < 3 Time Constants : 1 s and 10 s switchable Time Constants in Max Hold : 1 s Max Hold drift : < 10 % per 5 minutes with FSD Detector : True Peak-to-Peak : Time Constants : 1 s and 10 s switchable Max Hold drift : < 10 % per 30 minutes with FSD Rise Time : > 25 µs : 15 kHz LP filter Dynamic Range : for both detectors is 40 dB External Filter Sockets : 2 x BNC Signal level : 1 V PEAK or RMS Input Socket Impedance : 16 kΩ Recorder Outputs : Output Impedance : 1 kΩ AC : 2.7 V RMS for FSD. Overload 6.8 V peak
Mesure de Vibration – LICENCE Maintenance Aéronautique DC Log : 2 V for FSD, 0.05 V/dB. Overload 2.25 V DC Lin : 3 V for FSD. Overload 4.5 V Meter Calibration : Internal Oscillator : 80 Hz Internal Power Supply : Battery : 4 x 1.5 V - D cells, IEC type R20 Battery Life : 15 hours with Alkaline batteries Environmental : Temperature Range : -10 °C to +50 °C Humidity Range : 0 to 95 %RH, non condensing Electromagnetic : fields up to 100 A/m increases noise floor < 14dB
Mesure de Vibration – LICENCE Maintenance Aéronautique
Bruel & Kjaer 1621 Tuneable Band Pass Filter
The Tuneable Band Pass Filter Type 1621 is a variable filter intended for use with the general purpose B&K 2511 Vibration Meter for narrow band frequency analysis of vibration levels. Frequency Range: 0.2 Hz to 20 kHz in 5 ranges Pass Bandwidths: switchable : 3 % or 23 % (1/3 octave) Attenuation at 1/2 and 2 x selected frequency : switchable 34 or 16 dB Dynamic Range: > 40 dB RMS with 3 % bandwidth between 0.2 Hz and 6 kHz > 35 dB RMS with 3 % bandwidth between 6 kHz and 20 kHz > 40 dB RMS with 2 % bandwidth between 0.2 Hz and 20 kHz Accuracy of Indicated Frequency: qu± 1.5 % at 25 °C with additional ± 0.04 % per °C BNC Input: 1 V RMS or 0.2 V RMS switchable with crest factor of 5 Impedance 1 V input : 1 MΩ in series with 10 µF Impedance 0.2 V input : 200 kΩ in series with 10 µF BNC Output: Impedance: 0.5 Ω in series with 100 µF Load Impedance: > 25 kΩ Gain: 0 dB ± 1 dB Hum and Noise: 3 % Bandwidth 0.2 Hz - 6 6 kHz - 20 Frequency kHz kHz 1 V input 10 mV 18 mV 0.2 V input 2 mV 3.6 mV Hum and Noise: 23 % Bandwidth Frequency 0.2 Hz - 20 kHz 1 V input 10 mV 0.2 V input 2 mV
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