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Re: HP 401 c VTVM

 

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Your body is a capacitor, charged to varying voltage as you move around.? Any sensitive meter will jump around as you approach or withdraw.

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Dave Wise

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From: [email protected] [mailto:[email protected]] On Behalf Of Askild via groups.io
Sent: Sunday, November 07, 2021 10:34 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 401 c VTVM

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Hi Mark,

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Its normal for voltmeters with very high input impedance to not show stable 0V when probe is hanging free. Mine also jump around when touching the probe.?

The input impedance of the 410C is about 100MOhm, compared to most multimeters today that have 10MOhm.

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To see if the voltmeter is showing 0V with no voltage applied, you need to short the voltmeter probe and the ground wire.

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Regards,

Askild

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On Mon, Nov 8, 2021 at 1:40 AM mjavit01 via <MJavit=[email protected]> wrote:

Hello one and all,
I have recently acquired a HP 410 C meter from a friend.
It works great measuring resistance. I do not have the AC probe that may have come with it, so I cannot attest to its AC measuring accuracy. However when I try to measure something as simple as a AAA or 9-volt battery the meter does something I am unable to explain.
The meter movement will not land or stay on zero when I turn the function switch to DC+ or DC-. I find that when I handle the DC probe it is when the meter goes crazy. (also technical term used in describing human behavior).
If I run my hand along the probe wire I get the same reaction.?
If I conduct the test with out letting the meter settle at zero I get a very accurate reading.
I have checked the internals of the probe and find that the center core of the coax is connected to the resistor which is connected to the tip.
The shield is cut back and covered with shrink tubing eliminating any possible "short"
I have checked the continuity of both the shield and the inner wire of the coax and there is nothing unusual to report.

Any suggestions would be greatly appreciated

Respectfully

Mark

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