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Old 6th July 2008, 02:27 AM   #1
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Default Trashed moving coil Multi-meter????

Hi,

I had a moving coil multi-meter when switched to the 1x range for measuring resistor, there is a voltage of about 2v at the probes, does it mean it's no good ?

How I find out :
I was testing a speaker protection circuit where the speaker is grounded before the circuit is switched on. It also had a cut off protection whenere there is a DC voltage of over 1.5v appears at the speaker output of the amp. So I clamp the 2 probes at the amp. and speaker. terminals and start throwing the power switch but of course the relay never close becase there is a DC voltage supplied by the meter!!!!! I was lucky enough that during my repeat trails that I forget to probe the terminals and the indicateing leds turn on and when I probe the terminals again, the relays didn't close anymore. Thats when I suspect that there is something going on with my MC meter and measure the probes with another DVMM and find out the problem.

So is my MC multi-meter still usable? The only ocassion that I think it got trashed is that I once had it measure some current (ammeter@250mA fill scale) and the coil swing all the way to full deflection.

Tks for your input.
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Old 6th July 2008, 02:50 AM   #2
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Quote:
I had a moving coil multi-meter when switched to the 1x range for measuring resistor, there is a voltage of about 2v at the probes, does it mean it's no good ?
it needs to apply some voltage to measure resistance.
I don't think there is a recommended voltage.
As long it measures resistance and other things correctly, there is no need to trash it.
regards
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Old 6th July 2008, 03:48 PM   #3
Nordic is offline Nordic  South Africa
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Even with a digital meter I can light up an led useing only the probes...
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