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design a method to measure the input impedance of digital multimeter

Discussion in 'Electronics Homework Help' started by only6512, Mar 15, 2014.

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  1. only6512

    only6512

    18
    0
    Feb 15, 2014
    Hello~everyone
    I have a question about
    How to design a method to measure the input impedance of a digital multimeter?
    I think it may involve the use of ohm's law,
    can anyone help me?
     
  2. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    Indeed it does involve the use of Ohm's law. In this case, Ohm's law as applied to a voltage divider. You will need a stable voltage source to measure, and an appropriately sized resistor. Use the multimeter to measure the voltage of the source, then insert a series resistor and determine how much the voltage measurement has dropped. That gives you enough information to calculate the DC input impedance.
     
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