Atmel168A-PU-based ESR meter - using on a PSU

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  • xelectech
    retired tech
    • Nov 2014
    • 238
    • USA
    #1

    Atmel168A-PU-based ESR meter - using on a PSU

    I finally got caught up on my reading and have really been enjoying my new tool. Occasionally though I get unexpected results, especially while I was trying to locate defective components in an Antec psu.

    Twice I was on the backside of the ckt. bd. on the component leads and got a real low (like, say, 57pf) reading but after taking the cap out and measuring again the part reads ok.
    This occurred on a 22uf one and a 220uf one.

    Lots of OST in the box, and tan glue here and there, so far on the bigger caps I've checked
    I get what seems like reasonable readings for several caps in parallel. There's a copyright date of 2006 on the psu so I suppose it ought to be fully recapped but I don't know if I'm up to it. looks like it'll take forever...

    Anyway, what a pain to work on a crammed-full box like this, anyone have any tips?
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    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30906
      • Albion
      #2
      Re: Atmel168A-PU-based ESR meter - using on a PSU

      the reason you cant reliably do in-circuit testing is because other parts like diodes and chips have a capacitance!

      this effects all esr meters - the problem is many have been sold on lies!

        Comment

        • xelectech
          retired tech
          • Nov 2014
          • 238
          • USA
          #3
          Re: Atmel168A-PU-based ESR meter - using on a PSU

          Originally posted by stj
          the reason you cant reliably do in-circuit testing is because other parts like diodes and chips have a capacitance!

          this effects all esr meters - the problem is many have been sold on lies!
          Oh, okay, so it's pretty normal to have to pull some items, shoot 8^(

            Comment

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