Connect with us

how does a DMM take a differential voltage measurement

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

Scroll to continue with content
  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.

  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
  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


    ** Try:

    ...... Phil
  5. Charles

    Charles Guest

  6. Eeyore

    Eeyore Guest

    Don't use the circuit common.

    DMMs are differential measuring instruments by design.

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day