In message , Alan
writes
In message , "Dave Plowman (News)"
wrote


I've got some ways of calibrating DVMs,

While you may have some accurate ways of calibrating (or checking the
calibration of) a multi-meter I guess the average electrician doesn't.
Was that resistance measurement really 2 ohms or was it actually 4
ohms but with a partially fried ranging component?

How often would a sparkie want to measure more than whether 230V was
there or not with a DVM ?


--
geoff