Calibration - extent of

[WDMDL]

Hopefully I'll be in business by the end of this week, just getting a few things sorted out...

I've read numerous posts on calibration and check boxes etc, but I'd like to clarify exactly WHAT needs to be calibrated.

MFT - Obviously.

Martindale Voltage Indicator - ?

Martindale Phase rotation indicator - ?

Proving Unit - ?

Secondary test equipment used only as a fault finding aid, eg clamp-on ammeter, electronic multimeter - ?

I'm of the understanding that if you record the reading from an instrument on a cert, it must be calibrated, otherwise only a simple check-box arrangement is necessary.

By their nature, the Martindale kit is self checking when used correctly, though certain suppliers offer the option of cal certs for them.

Thanks,

Simon.

 

[Former Sponsor TM]

Hi Simon,
I'd recommend the "best practice guides" from the Electrical Safety Council.
(Guidance note 7) It goes into detail about Test instruments: Accuracy and consistency and calibration.
I pretty sure it's got all the information you need.

Best regards,
Matt