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how does a DMM take a differential voltage measurement

Discussion in 'Electronic Basics' started by panfilero, Apr 1, 2009.

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  1. panfilero

    panfilero Guest

    I've been trying to find some info on this on google... but I just
    keep finding sites on DMM and how to measure voltage with them... but
    my question is... how does a DMM manage to read a voltage without
    access to the common point of the circuit your measuring?

    If anyone knows of a good website that explains that could you please
    point me towards that... I can't find one.

    Thanks!
     
  2. bw

    bw Guest

    A voltage is a potential difference between two points.
    All voltage measurements are from point A to point B.
    On a DMM the voltage is from probe tip to probe tip. It helps to have good
    probes.
     
  3. Charles

    Charles Guest

    It's hardly arbitrary when measuring a voltage drop across a component.

    Generally, it's seldom arbitrary.
     
  4. Phil Allison

    Phil Allison Guest

    "panfilero"

    ** Try: www.aprilfool.com




    ...... Phil
     
  5. Charles

    Charles Guest

  6. Eeyore

    Eeyore Guest

    Don't use the circuit common.

    DMMs are differential measuring instruments by design.

    Graham
     
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