Back-to-back Comparison Calibration Standards

Back-to-back comparison calibration standard accelerometers permit NIST traceable calibration of accelerometers and other vibration sensors by the reference comparison method. The back-to-back reference calibration accelerometer is mounted to a mechanical exciter and the sensor to be calibrated is installed onto its surface. The output signals from the reference standard and transducer under test (TUT) are compared, permitting sensitivity, frequency response, and phase response verification of the tested unit. Frequency and amplitude inputs to the exciter can be varied to suit the desired test parameters. Included are interconnect cables and a dedicated signal conditioner for use with the reference standard to ensure a precise sensitivity at a common reference frequency. A variety of mounting studs and an NIST traceable calibration certificate are also provided. Readout instruments, shakers, and their controllers are not included.


  • 100 mV/g sensitivity
  • 0.5 Hz to 10 kHz (± 5%) frequency range
  • 85 to 264 VAC, 47 to 440 Hz powered
  • Optional battery powered



  • Model 394A10,1/4-28 threaded, mounting hole
  • Model 394A11, 10-32 threaded, mounting hole