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Insulation Tester.

Discussion in 'Hobby Electronics' started by John, Jan 21, 2004.

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  1. John

    John Guest

    Has anyone any experience with a good, cheap insualtion tester. The old
    megger with the handle used to work OK but I have not seen any of them for a
    while now. I think the regs say 500 volt.
    John
     
  2. Hello John,
    funny thing, I also, was just thinking about finding an old megger
    for insulation testing. Yes they very good. Hard to find now.

    I was also wondering about a good cheap or homemade
    electrical joint tester. Something like a low ohms meter
    that would pass 1 amp, 10 amps or more amps through
    an electrical connection and then measure the number of
    milli volts across the joint. Then was thinking, I wonder
    if Bob Parker had given any thought to a simple tester
    in a small box that might do the job with micros and
    clever tricks, along the same lines as his ESR meter.
    Any suggestions Bob?

    Regards,
    John Crighton
    Hornsby
     
  3. Phil Allison

    Phil Allison Guest



    ** The ESR meter is also a "low ohms meter" - it says so on the front. The
    resolution is 10 milliohms. The only limitation is that the connection is
    tested over a short distance - inches not metres.

    BTW Contact resistance falls as the current increases - so Bob's meter
    which uses low currents will give pessimistic ohmage readings for relay
    contacts etc.



    ........... Phil
     
  4. Dwayne

    Dwayne Guest

    Altronics do a Megger kit, I built one and works great
    has settings for 500v & 1000V tests.

    Dwayne
     
  5. Bob Parker

    Bob Parker Guest

    G'day,
    These days I don't follow the goings-on on newsgroups very closely,
    and I almost didn't see that. :)
    I haven't really thought about doing anything like that. Maybe a
    bit too specialized to be very popular as a kit/magazine project. As
    Phil said, contact resistance varies with current, which tends to
    complicate things.
    As for meggers, I bought a Hung Chang 500V one from WES Components
    a few years ago. It seems to do the job quite well, but I don't
    remember seeing it in the catalog lately. Maybe no-one was buying
    them, or maybe they don't meet some approval I don't know about....

    Cheers,
    Bob
     
  6. John

    John Guest

    Dwayne,
    What degree of difficulty is the megger kit? My eyes and hands are not what
    they were.
    For $59.00 it sounds just fine.
    John
     
  7. David Sauer

    David Sauer Guest

    Tried an electrical wholesaler?
    That's where most people buy them from.
     
  8. Dwayne

    Dwayne Guest

    Very easy from what I can remember
    You will need a multimeter to calibrate the unit

    Dwayne :)
     
  9. Hi John,
    Silicon Chip Mag May 1996 , has a gh voltage insulation tester which
    can produce 100V,250V,500V,600V,1000V.
    Ciao Andrew
     
  10. John

    John Guest

    Bob,
    Altronics have a Hung Chang 500V Q1240 for $95.00. Looks promising too.
    Thanks, John
     
  11. John

    John Guest

    I used a new junk email address here less than 3 hours ago. I forgot to
    disguise it and I have received this email twice.
    ================================================
    "A message which was sent to you was discarded by ENEA-Sophos MailServer
    Antivirus
    For your protection, the original message has been destroyed.
    The sender has been notified.
    The details of what was detected and the original message header are below.
    -----------------------------------------------------------------------

    ghjdh.exe e' infettato da W32/Gibe-F

    Totale infezioni: 1"

    ===========================================
    It does not take long , does it.
     
  12. Bob Parker

    Bob Parker Guest

    That's the one I've got. Works pretty well and also measures mains
    voltages. I was assuming that like WES, Altronics had discontinued
    selling it.
    I see that WES have a Kyoritsu insulation tester (ICT3132) for $299
    now, which can do 250/500/1000V tests plus continuity testing, with a
    a load of approvals.
    You're not wrong! :( If anyone's interested, Aussie company
    Bluebottle (http://www.bluebottle.com) tells me that their free
    challenge/response anti-spam service which has been dead in the water
    since being brought down by spammer attacks last October is going back
    online tomorrow.
    In that time I mentally calculate that I've had to manually sort
    through about 30K spams, wasting an entire day of my life doing it.
    It's going to be SOOOO good to be spam-free again. :)

    Cheers,
    Bob
     
  13. Ross Herbert

    Ross Herbert Guest

    John,

    This project was described in Electronics Australia May 1989 so if you
    can lay your hands on that issue you can assess the degree of
    dificulty.

    Ross H
     
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