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Sound and Vibration Instrument Hire and Calibration

B&K 4294 Vibration Calibrator Specifications


 
Bruel & Kjaer 4294 Vibration Calibrator
 
Bruel & Kjaer 4294 : Vibration Calibrator - hand held £ 5 a day *
 

Vibration System :


Electromagnetic Exciter with internal built-in accelerometer for servo regulation of vibration amplitude
 

Frequency :


159.15 Hz   ± 0.02 % (1000 rad/s)
 

RMS Vibration Levels


Acceleration 10 ms-2 (rms) ± 3 %
Velocity 10 mm/s (rms) ± 3 %    
Displacement    10 µm (rms) ± 3 %
 

Transverse Amplitude :


less than 5 % of main axis amplitude.
 

Distortion :


less than 2 % for 10 to 70 gram load; less than 7 % for 0 to 10 gram.
Use DB 2996 (10 g) with very light accelerometers to achieve 2 % distortion
 

Warm up time :


less than 5 seconds
 

Mounting Torque for accelerometer :


max. 0.5 Nm
 

Signal Duration :


103 ± 1 s with automatic stop
 

Long Term Stability :


better than 1 % per year for acceleration, velocity, displacement; better than 1O ppm per year for frequency.
 

Transducer Mounting :


Maximum Load : 70 grams.
Mounting Thread : 10-32 UNF
 

Battery Life :


Approximately 60 calibrations each lasting approximately 100 s with automatic switching off at the end of each calibration.
 

Dimensions :


Length : 155 mm
Diameter : 52 mm
 

Temperature Range :


+l0 °C to +4O °C for 10 ms-2 reference within ± 3 %
-10 °C to +55 °C for 10 ms-2 reference within ± 5 %
 

Humidity :


Up to 90 %RH (non condensing) at 30 °C
 

Battery :


1 x 9 V Alkaline battery - IEC type 6LR61
 

Weight :


500 g including battery and leather case
 

Accessories Include :


1 x Leather Case - KE 0278
1 x 10-32 UNF Steel Stud - YQ 2962
1 x 3 mm Mounting Disc Adaptor - DB 2996
 
E&OE - specifications subject to change without notice.