On Fri, 12 Mar 2004 22:00:00 +0000, in uk.d-i-y Steven Briggs
strung together this:

In message , Lurch
writes

If you're in the NIC you can now do 'self calibrations'.

How's that work then?

I assume some kit has to be checked every day / before use, i.e. I know
the insulation testers on the production lines at work are checked with
known standard test boxes every day.
Or do you mean checking accuracy of say a voltmeter?
At some point whatever you local "standard reference" is, is itself
going to have to be calibrated against something else that has traceable
calibration.

If you set up a test rig with a radial for testing Ze\Zs, a radial for
testing RCD, and a basic resistance box of whatever resistance you
want. Then you can check these with currently calibrated meters and
then use these readings to check the results of other meters.
Obviously there is still a need for at least one machine to be
calibrated by a 'proper' calibrator but I think the idea is if you
know how to use them competently then you'll know how to
check\calibrate them correctly as well. We had the NIC inspector round
recently and he clarified these points for me.
Have a look for 2080 electrical checkbox on
http://www.theinstrumentcentre.com/. (Catalogue - Multi\installation
testers)
It's basically a 'homemade' version of one of these.
--

SJW
A.C.S. Ltd.