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HP 3468A Bench Multimeter Repair

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    #1

    HP 3468A Bench Multimeter Repair

    Modemhead, a member here, has posted a new blog about a HP 3468A Bench Multimeter Repair. See

    http://mrmodemhead.com/blog/hp3468a-...imeter-repair/

    What is interesting is that I can't recall hearing about a shorted electrolytic capacitor on badcaps.net. I found a shorted ceramic capacitor in a 19 inch monitor, but never an electrolytic one.

    PS. The Fluke 8060A he is using to measure the resistance of the 27+ year old Sprague caps was also a victim of obviously bad leaking capacitors (just like my 8060A). It is documented at

    http://mrmodemhead.com/blog/fluke-8060a-repair/
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    #2
    Re: HP 3468A Bench Multimeter Repair

    Damn, nice looking meter.
    I haven't heard of a shorted electrolytic either.
    I would think it would explode or at least pop a top and ooze out.

    Still waiting for my 8040A, it seems to be vacationing in Erlanger, Kentucky.
    36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

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      #3
      Re: HP 3468A Bench Multimeter Repair

      I put one of the shorted caps on my power supply and slowly ramped up the current limit. The cap opened up at 620mA. It now measures 338uF, and 0.05 ohms on an ESR tester, and generally acts like a cap again. So whatever the fault was, it was destroyed (at least temporarily) by a little heat.

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        #4
        Re: HP 3468A Bench Multimeter Repair

        Somewhat related video on a shorted capacitor (jump to 11:23 if you don't have time or want to watch the whole thing).

        http://www.youtube.com/watch?v=at7GLypcLro

        One of the 4 main filter caps was a dead short as measured by a bench Fluke. A shorted cap is not something I would have tested for in the above video, but it looks like I will have to add that to my troubleshooting routine now.

        I tried fixing a HK AVR, but gave up after I couldn't get the stupid boards apart.

        Details for those interested.

        https://www.badcaps.net/forum/showthread.php?t=10066
        Last edited by retiredcaps; 03-29-2013, 12:07 AM.
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          #5
          Re: HP 3468A Bench Multimeter Repair

          One old 8050A which I got from the States (Ebay) it came with a burned resistor which was spliced in half and it was making contact occasionally.
          And it was effecting the power-on of the meter which suddenly it was turn off.
          This was a truly unexpected damage.
          But either way I am not easily surprised any more by anything unexpected those days.

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