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ACCELEROMETER CALIBRATION SYSTEMS

ACCELEROMETER SYSTEMS

Model Number3120BK3123AK SYSTEM SPECIFICATIONS Sensitivity @ 100 Hz, ±.05 10.00 mV/g100.00 mV/g Frequency Response, ±2% 10 to 10,000 Hz10 to 5,000 Hz Linearity, Full Scale ±1%±1% Range for ±5V Output, Full Scale ±500 g±50 g Accelerometer calibration by means of a doubleended reference (comparison) accelerometer is aconvenient way to determine the sensitivity and frequency response characteristics of unknownacceleration, velocity and displacement sensors. A vibration lab that is already equipped with anelectrodynamic shaker and control system can easily employ the Dytran model 3120BK reference accelerometer to accomplish in-house NIST traceable calibrations.Model 3120BK is a complete reference acceler-ometer kit containing a double ended 10 mV/gaccelerometer (model 3120B), a matchingcurrent source power unit (model 4119B), cables, mounting studs and a carrying/storage case. The accelerometer mounts to the shaker head bymeans of a 10-32 tapped hole. The outputconnector on the 4119B is a standard BNC jack.The carrying case provides the proper protection when sending the system out for periodic calibra-tion and certification. An alternate method of calibrating the system is the use of a singleended “transfer” standard accelerometer tocalibrate the double ended 3120B. A complete instruction manual is provided with the systemdetailing these procedures. For more informationon the back-to-back (or “piggyback”) calibration method, see the article “Back-to-BackAccelerometer Calibration” in the TechnicalArticles section of the web site.For calibration of velocity pickups and for lowfrequency calibrations below 10 Hz, a 100mV/g double ended reference accelerometer is offered, model 3123A. Model 3123A has 10times the signal level of model 3120B, a plus whensignal to noise problems arise, typically duringlow frequency, low g level measurements. Model3123A is also available in kit form as the 3123AK and is supplied with all of the same accessoriesas the 3120BK system. High end frequencyresponse of the 3123AK system is 5 kHz. Range, Force Lbs. ±40 Lbs.±10 Lbs. Electrical Noise, Equiv. g’s RMS .02 g, RMS.003 g, RMS Noise Level, Broad Band .2 mV, Pk-Pk.02 mV, Pk-Pk Output Impedance 2 Ohms2 Ohms INDUSTRIAL ACCELEROMETERS Sensitivity, Nominal 10 mV/g100 mV/g Temperature Range -60 to +250ËšF-60 to +250ËšF Thermal Coeff. of Sensitivity .03%/ËšF.03%/ËšF Transverse Sensitivity 3% Maximum3% Maximum Weight 85 Grams120 Grams Electrical connector manufacturer 10-32 Coax10-32 Coax Material, Non-Magnetic 300 Series S.S.300 Series S.S. Input Current Required 2 mA2 mA Input Voltage Required +20 VDC+20 VDC AMPLIFIER/POWER UNIT MODEL 4119B Output Current 4 mA4 mA Output Voltage +20 VDC+20 VDC Filter, Low Pass Active VCVSActive VCVS Attenuation @ 10 kHz 3%3% Temperature Range 0 to 120ËšF0 to 120ËšF Weight 907 Grams907 Grams Sensor Connector BNC JackBNC Jack Output Connector BNC JackBNC Jack Power source 110V, 50-60 Hz110V, 50-60 Hz SYSTEM COMPONENTS SUPPLIED FOR BOTH MODELS
(1) 3120B or 3123A Accelerometer, (1) 4119B Amplifier/Power Unit, (1) 6011A05 Input Cable, (1) 6020A05 Output Cable, (2) 6200 10-32Mounting Studs, (1) 6201 10-32 to 1/4-28 Mounting Stud, (1) Carrying Case.NOTES: 1) Calibrated with a transfer standard weighing 19 grams. NIST traceability included.2) Force Lbs = product of test accl. weight (Lbs) X g level.3) 220V version available, Model E3120BK or model E3123AK 22