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Calibration is conducted at our factory using a ‘back-to-back’ reference accelerometer with a traceable performance to UK National Standards. Both devices are fitted to an electromagnetic vibration system and excited at various frequencies. The accelerometer sensitivity figure is calculated from the measurement of amplitude of vibration and of its output and is specific to the frequency at which measurement is made. If required, we can provide a plot showing the frequency at which measurement is made.
A typical response frequency graph

We can also undertake recalibration If required, particularly for research and scientific applications where absolute acceleration intervals are important.
For industrial use, generally changes in vibration level trends are required and recalibration is normally unnecessary. However, with the portable Vibration Meter (VM110/115 ) because of the typical exposure to irregular use and rough handling, we recommend you have this checked and recalibrated annually.