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Shunt type

  • alaskanalain Monday, August 18, 2014 11:42 AM Reply
    What shunt do I use with this to make it read to 50 to 100 amp? The built in shunt only goes to 10A. (I have a 100A 75mV but that does not show accurately.)
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  • Tendyxu @DX Staff @DX Staff Tuesday, August 26, 2014 11:10 AM Reply
    [email protected],
    The max. is 10A.
    Thanks for your patience.
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  • PolarCircle Thursday, November 6, 2014 4:35 AM Reply
    If you shunt it to make 9/10 of the current go through the shunt instead of the instrument, you will be able to measure 100A. It will indicate 10A though (as this is the current that actually goes through the instrument). So you will have to make a mental note that the actual values is 10 times bigger. The instrument must be linear for this to work (because the shunt is linear).

    To calculate the correct value of the shunt
    1 measure the voltage at the end of the current sensing wires while you push 10A through the meter.
    2 select a shunt, or group of shunts, that will have the same voltage at 90A (and that survives the current).

    This is a quite common trick for measuring larger currents and for reducing the voltage drop over the instrument.
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