strange readings from mini 3 wire volt meter (id 705)

by iotium on Wed Dec 05, 2012 6:33 pm

I'm getting some strange readings from a mini 3 wire volt meter. I was using it for a project I'm working on and it seemed fine at first. Then the voltages it was displaying seemed very high, so I did a test: I hooked it up directly to a single 8.4 V power supply with nothing else connected.

When I connect the test voltage lead to the PS ground, it reads 21.9 volts. When I connect the test voltage lead to the 8.4 V line, the voltage goes above 99.9 V and the display just says " - - ". When I don't connect the voltage test lead to anything, it goes to about 45 V. I checked all of these voltages with a DMM and I got the expected values: 0 V and 8.4 V.

I have it wired as per directions in a different thread: black wire to ground, red to positive supply, and white is the test voltage lead.

Any advice would be appreciated.
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Re: strange readings from mini 3 wire volt meter (id 705)

by adafruit_support_bill on Thu Dec 06, 2012 5:58 am

it seemed fine at first. Then the voltages it was displaying seemed very high

So it was giving reasonable readings when first wired up?
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Re: strange readings from mini 3 wire volt meter (id 705)

by iotium on Thu Dec 06, 2012 12:59 pm

That's right. I used it for about 5 days and it was working fine. It was powered from a 6 V supply and correctly measured voltages from 0 to 35 V.
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Re: strange readings from mini 3 wire volt meter (id 705)

by adafruit_support_bill on Thu Dec 06, 2012 1:05 pm

OK. Contact support@adafruit.com with a link to this thread to arrange for a replacement.
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