Ammeter shunt resistance

Discussion in 'General Electronics Chat' started by Zeebit, Mar 6, 2014.

  1. Zeebit

    Thread Starter Member

    Nov 8, 2013
    72
    0
    Does anyone here tried to measure the shunt resistance of those cheap eBay ammeters? I am referring to the ones with built in shunts like this one or something similar.
     
  2. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    1,145
    204
    No, but I have that meter with the external shunt. 50A is 75 mV, so it should give you a ballpark. There are a couple of adjustment points, but no instructions and I have no idea of it's range.

    Jut remember, that you have to measure a current thru it and the voltage ACROSS it. Where you measure the voltage matters. The external shunt has big screws (for the current) and small screws (for measuring the voltage). The voltage points compensate for any contact resistance.

    A reminder that this meter has to be inserted in the ground leg. I was THINKING about playing with how to make that restriction not matter,
     
  3. PackratKing

    Well-Known Member

    Jul 13, 2008
    850
    215
    Item location:
    Guang Zhou, China :cool: 'nuff said !!
     
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