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Ammeter adjustment / shunt

Discussion in 'General Electronics Discussion' started by s57aw, Feb 12, 2014.

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  1. s57aw

    s57aw

    9
    0
    Dec 18, 2013
    Hello,

    I would like to mesure reverse voltage difference from linear potenciometer with 40uA Ammeter. I get 10.70v DC from the pot and that needs to be full scale on ammeter and 9.5 v should be 0 on ammeter. I want a 40uA meter movement to indicate zero when there is 9.5v and full scale when there is 10.7v.

    Source voltage to the pot is 12.05v

    I need to add shunt resistor and probably some resistors / trimmer in series to get just a right value.

    I am not a professional and I would be happy to get some help on this values

    Regards,

    Robert
     
    Last edited: Feb 12, 2014
  2. duke37

    duke37

    5,231
    718
    Jan 9, 2011
    You will need a voltage reference of 9.5V.
    The meter will need to be connected between this voltage and the voltage to be measured, in series with a resistance to add up to 65k75.

    If the source voltage has a significant source resistance, the meter series resistance will need to be reduced.

    You may like to put a diode across the meter to protect against excess reverse voltage.
     
  3. s57aw

    s57aw

    9
    0
    Dec 18, 2013
    Thanks a lot ... it helped

    Robert

     
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