Manufacturers' Specifications

Bruel & Kjaer 4294

Vibration System :
Electromagnetic exciter with internal built-in accelerometer for servo regulation of vibration amplitude

Frequency :
159.15 Hz   ± 0.02 % (1000 rads^-1)

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

Gracey and Associates   01933 624212

BSI approved for the hire of noise and vibration instruments

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