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Fluke Multimeter

Discussion in 'General Electronics Discussion' started by PeteVee, Jun 28, 2017.

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  1. PeteVee

    PeteVee

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    Apr 21, 2017
    I've been using an Ideal 61-314 DMM for a few years. When working on guitar amps I often test capacitors in circuit and get a "close enough" reading, just to see if the capacitor is still in the ballpark and hasn't gone bad. I figured I needed a better meter for testing plate current etc., so I bought a used Fluke 175. With the Fluke I can't test caps in circuit, I get either OL, 0 nF, or the reading jumps around in an apparently random fashion. Is something wrong with this meter or is it to be expected (ironically) with a high end meter?
     
  2. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    Ya gotta pull 1 cap lead out of circuit to be able to test , fully out of circuit, otherwise you got all potential parallel or series shunted variants in the involved circuit.
     
    FuZZ1L0G1C and Richard9025 like this.
  3. PeteVee

    PeteVee

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    Apr 21, 2017
    Yeah, I kind of expected that answer, and thanks, but it doesn't really address my question. I know as rule you have to test out of circuit. But as I said, with the circuits I'm dealing with I can often get a ballpark reading on the cap in question without removing from the circuit when using the Ideal meter. Not so with the Fluke. So the question again is, is this to be expected with the Fluke or is there possibly something wrong with it?
     
  4. Richard9025

    Richard9025

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    May 24, 2016
  5. davenn

    davenn Moderator

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    Sep 5, 2009
    and you will find "not so" with most other brands not just Fluke
    I am surprised you other meter will give a useable reading of a cap in circuit
     
  6. PeteVee

    PeteVee

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    Apr 21, 2017
    Swear to God.
     
  7. davenn

    davenn Moderator

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    Sep 5, 2009
    :)


    even my dedicated Capacitance meter ( it does nothing else) wont measure in circuit
     
  8. PeteVee

    PeteVee

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    Apr 21, 2017
    Well to be clear, I'm not saying it's fool proof or highly accurate, and certainly it won't work in certain situations e.g. where there are other components in parallel, but more often than not it gives me a reasonable indication of whether the cap is healthy or not.
     
  9. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    Sir PeteVee . . . . .

    I just noticed that my 24" crystal ball was throbbing in intensity as I was reading . . . . Now if there is a good possibility that you are mostly dealing with tube amplifiers the have very high vaues of resistors .
    If they ended up shunting connections tied into that tested capacitor circuitry there wouod be minimal interference.
    The worse case I could think of, would be is testing a cathode by pass capacitor, which typically has a lower resistance shunting it.
    Of my 8 or so FLUKES, of which which I have, both the 10 and 12 series, which were being the only ones which had capacitance handling functions.

    Any one out there still running a FLUKE differential voltmeter . . . . which was GOD's gift of accuracy back in the '60's ?

    [​IMG]

    73's de Edd

    .
     
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