On 12/05/2019 07:49, Brian Gaff wrote:
If you are measuring volts then ac is best on a calibrated scope of course,
but I've seen some very strange results from clamp meters in the past, and
after all there are a lot of variables going on all at once.
Brian


I didn't know you could measure volts with the clamp part of a clamp meter.

If it is of the newer (as in less than 25 years old) hall effect sensor
devices then it will be more susceptable to stray magnetic fields. There
should be a calibrate/zero button on it somewhere which you should use
just before you clamp on to cancel all these effects out before measurement.