Ac peak current meters

Discussion in 'The Projects Forum' started by eleceng16, Feb 14, 2013.

  1. eleceng16

    Thread Starter New Member

    Mar 26, 2012
    6
    0
    I've read about instrumentation to read ac RMS values (with rectifier instruments/ moving iron ... ) but how is it possible to directly read an ac peak current value?

    Thanks :D
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,993
    3,227
    Rectifier instruments generally read peak values, not RMS.

    In that vein, you use a rectifier and capacitor (to hold the peak value) to read the peak of an AC signal. If you can't tolerate the 0.6V or so drop from the rectifier (diode) then you can use a precision peak hold circuit using an op amp, with the diode in the feedback loop to essentially cancel the forward drop from the diode.
     
  3. #12

    Expert

    Nov 30, 2010
    16,257
    6,763
    google: precision rectifier
     
  4. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Or do it digitally. Take a lot of samples per second and display the highest sample(s).
     
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