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Q: Construction of a 8.5 digit multimeter

Discussion in 'Electronic Equipment' started by Harald Noack, Feb 13, 2005.

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  1. Harald Noack

    Harald Noack Guest

    Hello!

    Has someone of you experience how a high precision multimeter is constructed
    ?

    e.g.: http://www.home.agilent.com/USeng/nav/-11250.536881781/pd.html

    How is the voltage reference stabilized? (by using an oven?)

    Are the input voltage divider temperature stabilized ? (temp. coeff.)

    How is the self calibration done?

    What type of ADC is used (maybe time to digital converter) ?

    How is the integral and differential non-linearity measured and compensated
    ?



    THANKS a lot for your help

    Harald Noack
     
  2. If you peruse back through old copys of the HP Journal, there was an
    article on the design of the HP3458A, which should answer your questions
    in detail. Mine are packed away so I can't give you the date.

    Hope this helps

    Andrew
     
  3. CJT

    CJT Guest

    Careful -- precision isn't worth much without accuracy, and you're going
    to have a heck of a time calibrating to a commensurate accuracy.
     
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