2. Medium-frequency periodic calibration

2.1 Absolute calibration

A calibration is said to be absolute when the composite input variable, in this case acceleration, is calculated by measuring each of its primary components. In the case of acceleration, which is expressed in meters per square second, both length and time (frequency) are measured.

In these methods, the accelerometer is subjected to sinusoidal vibratory motion, the amplitude and frequency of which are measured. The ratio between the electrical output and the acceleration...