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Strange readings on digital multimeter

 
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essexboy
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PostPosted: Mon Jun 23, 2008 6:43 pm    Post subject: Strange readings on digital multimeter Reply with quote
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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PostPosted: Mon Jun 23, 2008 8:19 pm    Post subject: Reply with quote
Normal.
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA
PostPosted: Tue Jun 24, 2008 1:46 am    Post subject: Re: Strange readings on digital multimeter Reply with quote
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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