Re: 9 mV noise on AC voltmeter

It is normal that on the very low voltage AC scale and the leads
are terminated, the meter will read something. The reading may
be in the area of a small number of millivolts.

True, but the OP stated that the reading was the same whether or not the
leads were shorted.

I checked my Fluke 87 set to 4.5 digits. With the leads open, I get a
residual of about 3mV (though this varies with the lead position and
separation, of course). When the test leads are shorted, the reading drops
to less than 2mV and stays there.

I'd say there's definitely something wrong with the OP's meter. Whether it's
significant is another matter.


.

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