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Question about ac adapter voltage

Discussion in 'General Electronics Discussion' started by revv, Jun 20, 2012.

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  1. revv


    Jun 16, 2012
    when I plug in my AC to DC adapter into the wall and measure voltage I always get -2.00v for example if I put the switch to 12v I get 10.00v that normal?
  2. davenn

    davenn Moderator

    Sep 5, 2009
    you would only need a little inaccuracy of the power adaptor and also a little inaccuracy of the test meter and yes that could be a reasonable reading.

    Have you ever checked the meter with a GOOD know voltage to check the meter's accuracy?
    Is the power adaptor a regulated DC out ?
    if it is it should be accurate to within ~ 0.5V

    Most unregulated supplies will have a significantly higher voltage that drops under load

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