Accelerometer convert mechanical vibrations into electrical voltages. The sensitivity determines which voltage is produced by a certain vibration. This is a characteristic feature of each sensor. In order to determine the sensitivity of accelerometers a vibration calibrator is used.
A vibration calibrator generates a sinusoidal mechanical vibration signal with defined amplitude and frequency. The adjustable values are traceable to national or international standards.
During calibration, the accelerometer is assembled on a moveably mounted steel bolt of the vibration calibrator (typically by screw). This steel bolt is set to vibrate by electrodynamic or piezo-actuatoric systems.