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essexboy
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 Posted: Mon Jun 23, 2008 6:43 pm Post subject: Strange readings on digital multimeter |
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| I have a Clarke autoranging digital multimeter. If I switch it to read d.c. or a.c. volts, without anything connected to it, it shows spurious constantly varying readings of up to several hundred millivolts. If I then connect the test leads and short them together, the readings fall to zero. It seems to read correctly when connected to a voltage source. Are these spurious open circuit readings normal, or is it about to die? |
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| Posted: Mon Jun 23, 2008 8:19 pm Post subject: |
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vtech
Joined: 08 May 2006
Posts: 1264
Location: USA
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| Posted: Tue Jun 24, 2008 1:46 am Post subject: Re: Strange readings on digital multimeter |
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| essexboy wrote: | | I have a Clarke autoranging digital multimeter. If I switch it to read d.c. or a.c. volts, without anything connected to it, it shows spurious constantly varying readings of up to several hundred millivolts. If I then connect the test leads and short them together, the readings fall to zero. It seems to read correctly when connected to a voltage source. Are these spurious open circuit readings normal, or is it about to die? |
Due to high input impedance & the nature of digital counter circuitry, it is a very common.
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