The Dytran model 3120BK is a back–to–back accelerometer calibration system for low frequency, low g level measurements. The system features model 3120B double ended IEPE reference (comparison) accelerometer, offering a convenient means of determining the sensitivity and frequency response characteristics of unknown acceleration, velocity and displacement sensors. A vibration laboratory already equipped with an electrodynamic shaker and control system can easily incorporate use of the model 3120B to accomplish in–house NIST traceable calibrations.

Back–to–back comparisons with a double ended calibration standard accelerometer, such as the Dytran model 3120B, entails mounting the test accelerometer directly to the top mounting surface of the calibration standard (model 3120B) and driving the coupled pair with an electrodynamic shake system at various frequencies and amplitudes. At each test frequency, the amplitude is set, and the corresponding output read from the test accelerometer. The system includes model 4119B power supply unit, 3120B accelerometer as well as cables and accessories.