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  1. #1
    Join Date
    Aug 2012
    Location
    Currently live In Berks County PA and work in New Jersey
    Posts
    2

    what's the best megometer for a decent price

    I apologise in advance if this question has been asked before, but I was wondering what megometer was thought to be a good buy for a decent price. I need to get one and the one I choose will become the company standard so any help would be appreciated.
    Thanks,
    Bill

  2. #2
    Join Date
    Dec 2011
    Location
    Cincinnati
    Posts
    27
    SUPCO M500 ABOUT $100 WORKS WELL

  3. #3
    Join Date
    Jul 2005
    Posts
    5,359
    Quote Originally Posted by HVACR2012 View Post
    SUPCO M500 ABOUT $100 WORKS WELL
    The M500 is quite possibly the worst megohmmeter ever made.

  4. #4
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    If you are using one as a one time pass/fail test for condemning compressors, you are most likely condemning a lot of perfectly good compressors.

    Quote Originally Posted by hvacrmedic View Post
    The M500 is quite possibly the worst megohmmeter ever made.
    Nah, it is 2nd to the Supco megohm meter it replaced.
    If more government is the answer, then it's a really stupid question.

  5. #5
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    http://fieldpiece.com/megometers/smg5

    mine has served it's purpose through the years I've had it
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  6. #6
    Join Date
    Aug 2012
    Location
    Richmond, Virginia
    Posts
    91
    I 2nd that ^^

  7. #7
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    What the heck does 100 bucks get you in a megger?

    When I buy an instrument like a megger I look for certification from a testing authority.

    A bunch of green and red LEDS don't cut it. You aren't just looking for a ground resistance value, you are evaluating the dialectical strength of the winding which is expressed in mega ohms.. Thru RSES training we used an old crank mega ohm meter and the idea was if you got a bad reading it was most likely moisture in the system conducting a path thru micro flaws in the windings.

    A deep vacuum was called for and a new LLFD and another megger test was conducted to evaluate dielectric improvement .


    I had to dig deep in my SAMs just to make sure these facts.



    ( I already knew them to be true but I just wanted to be sure)

    I would only buy a direct reading megger. It lets you know the TRUE state of you windings.

    Supco sold a whole bunch of micron gauges that show only an LED at a certain micron level but no actual digital reading.

    Would you trust one of those to day or would you buy a BluVac? Same logic applies to an instrument as important as a megger.

  8. #8
    Join Date
    May 2010
    Location
    Canada
    Posts
    799
    The fluke 1520 is nice.

  9. #9
    Join Date
    Apr 2011
    Location
    Coastal Maine
    Posts
    808
    I tend to agree with HVAClover on this one, although not as stern in my objections. A megaohmmeter is a useful tool with hermetic compressors. It is just that, a tool, among many others. I have used them as a final check before condemning a compressor. Mine is older than most of you guys. I just bought one of the Exetech analogs as my old one is tired of being bounced around in the back of the truck.

    But there is no single tool or meter that will do everything for you.

    In my opinion, stick to the analog meters when reading MegaOhms.

    Good Luck.

  10. #10
    Join Date
    Oct 2010
    Location
    AZ
    Posts
    632
    I agree w/ hvaclover. I don't know how good extech products are but they have a real megger for under 200

  11. #11
    Join Date
    Dec 2004
    Location
    Grand Rapids, MI
    Posts
    610
    For our company that does res. service only, a 'megohm' reading is just an indication of the windings insulation.
    For a GM plant that monitors the motors for an assembly line, I would buy the best one possible.
    luck dan

  12. #12
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    Quote Originally Posted by danielworkerbee View Post
    For our company that does res. service only, a 'megohm' reading is just an indication of the windings insulation.
    For a GM plant that monitors the motors for an assembly line, I would buy the best one possible.
    luck dan
    a megger was designed for a hermetic comp, not an open motor. but I'm sure a megger is misapplied like a lot of instruments.

  13. #13
    Join Date
    Jun 2012
    Location
    East tx
    Posts
    164
    I bought a fluke 1587. It's very handy and have used it several times. Wasn't too terribly bad on price either

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