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DVM measuring method

Discussion in 'Electronic Equipment' started by davew, Aug 31, 2004.

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  1. davew

    davew Guest

    I'm working at a univercity where were're teaching electronics and
    I want to find out how DVMs particulary the standard type we use[1]
    measure their values and achieve the accuracy stated.

    Do they use the wheatstone bridge method or is there another method
    with modern digital meters.

    Thanks for any help or pointers to help/info

    [1] Ours are mostly Black Star 3 1/2 digit nothing expensive just basicspec
  2. Go to

    for a short description of these IC's

    regards Andrew
  3. Robert Baer

    Robert Baer Guest

    Youse no engrish?
  4. John Miles

    John Miles Guest

    You can download the service guide for the HP 34401A DMM (a very popular
    lab-grade model) at
    90013.pdf (160 pages, 12 MB). HP service manuals generally make
    excellent tutorials.

    Short answer: no, direct A-D conversion is the usual measurement
    technique in commercial meters. Certain RF instruments use the
    Wheatstone Bridge principle to deal with complex impedances, but it's
    not widespread elsewhere.

    -- jm
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