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Voltage Indicator & Proving Unit Calibration

Penpoll 77
Should voltage indicators & proving units be calibrated annually yes or no? rationale for either answer would be appreciated thanks.
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  • 0
    Surely Voltage indicator units are just GO or NO go devices. Or are you thinking of something more complicated? If the Voltage indicator is just a light or light and buzzer device than no calibration is required. It either works correctly or it does not. The same with proving units, they either work or not. Both devices can be easily tested for correct operation.


    But, if the Voltage indicator has Voltage bands with rows of L.E.D.s showing Voltage ranges, as a rough indicator of Voltage present, like 12V, 24V, 150V, 250V, 400 V etc. then perhaps it should be tested for correct operation periodically. But in most cases the user, being familiar with its normal correct operation, would quickly notice if it was faulty in use. (We hope).


    Z.
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  • 0
    Surely Voltage indicator units are just GO or NO go devices. Or are you thinking of something more complicated? If the Voltage indicator is just a light or light and buzzer device than no calibration is required. It either works correctly or it does not. The same with proving units, they either work or not. Both devices can be easily tested for correct operation.


    But, if the Voltage indicator has Voltage bands with rows of L.E.D.s showing Voltage ranges, as a rough indicator of Voltage present, like 12V, 24V, 150V, 250V, 400 V etc. then perhaps it should be tested for correct operation periodically. But in most cases the user, being familiar with its normal correct operation, would quickly notice if it was faulty in use. (We hope).


    Z.
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