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4-20ma

Discussion in 'Electronic Design' started by Norm Bourne, Sep 14, 2004.

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  1. Norm Bourne

    Norm Bourne Guest

    I have a 0-1ma ammeter which I have configured to read 0-20ma, (no Big
    Deal)and will be scaled to read Percent.

    Most instruments give a signal of 4-20ma. and what i need to do is to
    offset the signal so that 0% is equal to 4ma (suppressed Zero) and
    100% is equal to
    20ma.

    Does anyone have any ideas on how this can be achieved.

    Many Thanks,

    Norm.
     
  2. Don Pearce

    Don Pearce Guest

    Is there a zero-setting screw on the front? If there is, that is the
    way to do it. Set the shunt resistor value for 16mA FSD, then put 4mA
    through the meter, and tweak for zero.

    d
    Pearce Consulting
    http://www.pearce.uk.com
     
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