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Schematic for capacimeter project

Discussion in 'Electronic Design' started by demonio, Mar 20, 2007.

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  1. demonio

    demonio Guest

    Dear Sirs

    I need a project for capacimeter in analog way.
     
  2. Sorry, only down Argentine way.
     
  3. Rich Grise

    Rich Grise Guest

    Go to the other side of google, and type "capacitance meter" into the
    search box.

    Good Luck!
    Rich
     
  4. D from BC

    D from BC Guest

    I have an interest in this area to to measure anodized layer
    thickness.
    Guessing at Techniques.....
    1) RC voltage divider driven by an audio oscillator.
    2) Ctest is part of an LC oscillator, phase shift or hysteresis
    oscillator.
    3) Constant Iout. Time is measured to determine Ctest.
    4) C measurement chip??
    5) Maybe some method of phase measurement

    I'd probably go for the voltage divider technique..
    D from BC
     
  5. whit3rd

    whit3rd Guest

    Well, there's lots of ways to do that. Simple way #1, just
    connect line current (this presumes constant power voltage)
    to one side of the capacitor, and rectify the current through
    the capacitor and run it through a moving-needle meter movement.

    This only requires two diodes, a meter, and a known AC source.
    Downside: high voltages blow up some capacitors, and other
    capacitors will blow up your meter movement. Also, don't
    touch it with the power on!

    Better solutions require other (safer) AC sources, and use
    amplifiers with range settings.

    For practical purposes, digital C-meters are easy to build; it turns
    out
    that the usual voltmeter (dual-slope converter) operates in two
    phases,
    first charging a capacitor with an unknown, then timing the
    discharge with an accurate known discharge current source.
    If you give the capacitor a known voltage in the first phase, the
    discharge time (and thus the digital readout) is proportional
    to the capacitor value.
     
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