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Testing A Capacitor

Discussion in 'General Electronics Discussion' started by stuart sutherland, Jan 16, 2017.

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  1. stuart sutherland

    stuart sutherland

    12
    0
    Jul 6, 2015
    Hi all,

    I want to measure a capacitor to prove it is all ok. It's stand alone, so not connected to anything else.

    I know I can set a DMM up to measure capacitance and then just do it that way.

    I.e) my cap is 0.1uF so put DMM across it and ready somewhere in that region.

    Question is if my DMM can't measure capacitance, what reading would I get if I measure resistance across the capacitor?

    Scott
     
  2. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    It will read infinite. On a large one it will resd low and increase over time.

    Bob
     
  3. stuart sutherland

    stuart sutherland

    12
    0
    Jul 6, 2015
    Thanks Bob.

    So if I read very low resistance across the capacitor (ie short) then the capacitor is no good?
     
  4. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    Yep, unless it is like a 1F supercap. For a 100nF definitely bad.

    Bob
     
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