Electronics > Metrology

DMM behaviour

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donlisms:
Another way to look at is (1) these are two different error conditions, and (2) the meter is indeed giving an error indication for each.

Harfner:
I am not aware of DMMs trying detect that sort of error (having a voltage while switched into resistance mode). It would not work reliably for a small voltage and the user is supposed to know that stuff.
In fact I saw a negative resistance at least once, with the feeling of "damn, you did not check there is no external voltage".
At least some isolation meters however do make a check for voltage before measuring resistance. But they look for mains voltage before putting out 1000V. That is easier to do. 

tggzzz:

--- Quote from: Harfner on February 29, 2024, 09:39:00 pm ---In fact I saw a negative resistance at least once, with the feeling of "damn, you did not check there is no external voltage".

--- End quote ---

Some meters do that in 4wire mode, if you connect the sense wires the wrong way round :)

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