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Multimeter Problem.

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Please help. I have a second hand P.O. meter no 12 C/1. It is a moving coil meter. It reads o.k. on Volts but under reads on Ohms. The zeroing pot does not seem to work. A label inside states that it has thick film components. Why won't it read Ohms accurately? Can it be repaired.

Thanks,

Z.

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  • 0

    Can it be repaired.

    Of course it can - anything can. Whether it's economic to do so however…

    If volts part is OK, but the resistance range isn't, my guess would be something that's only in-circuit for the resistance mode must be the cause. I don't know the details of that particular meter but would guess at something like: a) the battery, b) dirty contacts on the selector switch, or c) one of the other components (e.g. resistor) used in the resistance circuit having gone out of spec.

       - Andy.

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  • 0

    Can it be repaired.

    Of course it can - anything can. Whether it's economic to do so however…

    If volts part is OK, but the resistance range isn't, my guess would be something that's only in-circuit for the resistance mode must be the cause. I don't know the details of that particular meter but would guess at something like: a) the battery, b) dirty contacts on the selector switch, or c) one of the other components (e.g. resistor) used in the resistance circuit having gone out of spec.

       - Andy.

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