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Apart from the factory calibration an accuracy test or re-calibration can be carried out by the user. For this a vibration calibrator is required. Metra offers the instruments
PCE-VC20 and PCE-VC21 (Figure 39). They can generate one or more vibration amplitudes and frequencies with defined accuracy. For the calibration of the PCE-VM
25 a sufficient
acceleration would be 10 m/s² at 159.2 Hz (radian frequency 1000 s-1).
Figure 39: Vibration Calibrator PCE-VC21
To calibrate the instrument, open the “Calibration” menu and select „Vibration calibrator”. You will be requested to mount the sensor on to the vibration exciter (Figure
40). This is done using the magnetic base. Press OK.
Figure 40: Calibration menu
The PCE-VM 25 is now ready for the reference vibration signal. It displays the measured acceleration (Figure 41).
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