Re: 9 mV noise on AC voltmeter
- From: Andre Majorel <cheney@xxxxxxxxxxxxxxx>
- Date: Sat, 4 Oct 2008 22:02:01 +0000 (UTC)
On 2008-10-04, William Sommerwerck <grizzledgeezer@xxxxxxxxxxx> wrote:
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 didn't make myself clear. With the leads open, you get on the
order of 1 V, which doesn't surprise me considering the 10 M
input impedance of the meter.
What I don't get is how, after shorting the plugs with a 2-cm
long piece of wire, switching to "Velec" mode (270 k input
impedance), switching off all monitors and fluorescent lamps in
the vicinity and going outside, you *still* get 9 mV.
Still no service manual forthcoming from Chauvin-Arnoux. What.
A. Surprise.
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.
--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
You measure democracy by the freedom it gives its dissidents, not
the freedom it gives its assimilated conformists -- Abbie Hoffman.
.
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- From: Andre Majorel
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