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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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    AJJewsbury: 
     

    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.

    Perhaps somebody has used the meter set to Ohms on a live system and damaged a resistor. I can't think that resistors naturally degrade at 1.5 Volt use. I cleaned the selector switch and tried new 1.5 Volts cells but to no avail. The higher Ohms range uses a 15 Volt battery which I have not been able to source yet.

    Z.

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  • 0

    AJJewsbury: 
     

    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.

    Perhaps somebody has used the meter set to Ohms on a live system and damaged a resistor. I can't think that resistors naturally degrade at 1.5 Volt use. I cleaned the selector switch and tried new 1.5 Volts cells but to no avail. The higher Ohms range uses a 15 Volt battery which I have not been able to source yet.

    Z.

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