Kewtech Nulling Leads with the KT65DL

[@ashvanbro9329]

Won't let me null my leads

[@robinpenny3193]

Why is it necessary for the continuity test to be running when you turn null off? I have always found this a rather unintuitive requirement, that left me scratching my head a number of times when I first started using the instrument.

[@buybrandtoolsuk]

The memorised null value can be cancelled by disconnecting the test leads and pushing the Continuity Null button (F1) with the test button pressed or locked. When this is cancelled you will know because NULL OFF is displayed on the LCD. CAUTION - before taking any measurements always check the leads have been zeroed. - Hope this helps!

[@robinpenny3193]

Unfortunately it doesn't help. That's more or less what I was saying myself. The question was why would it need to be done like this? Null off is surely Null off regardless, of the presence of any leads (or otherwise) or test reading being taken at the time, so we seem to have a superfluous limitation. Obviously both are required when turning null on and it makes perfect sense in that scenario. I wonder if it could be actually measuring some internal resistance, so "Null Off" is actually zeroing some internal resistance of the meter.