Kelvin Double Bridge

Discussion in 'General Electronics Chat' started by bd525, Jan 21, 2010.

  1. bd525

    Thread Starter New Member

    Nov 11, 2009
    28
    0
    I am reading the section on DC metering stuff and have a question about the kelvin double bridge...

    [​IMG]

    I am having trouble understanding why we added Rm and Rn to the circuit exactly... Can someone help explain what this does to/for the circuit?
    I know we are trying to eliminate the voltage drop across the wire connecting Ra and Rx but how does it do this?>

    Thanks!
     
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