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MEGGER testers current limited?

Discussion in 'Electronic Repair' started by SuperChickenBBB, Apr 15, 2004.

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  1. Does anyone know if all MEGGER resistance/isolation/insulation testers
    current limited? I assume not, but can anyone give examples?
  2. Don Young

    Don Young Guest

    All the ones I have seen are current limited. Testing insulation with
    unlimited current available would almost surely damage the insulation since
    any leakage would heat the path, thus increasing the leakage, thus
    increasing the heat, thus increasing the leakage, etc., etc..
    Don Young
  3. Any idea of what typical current limits might be? 2ma-25ma? more?
  4. Don Young

    Don Young Guest

    It has been quite a while since I have calibrated any of these but I am
    pretty sure that microamperes to a few milliamperes is typical. You can
    check it by connecting an ammeter across the test leads. You might find some
    specs on the internet by looking for "Biddle" which was one of the original
    manufacturers and owns the trademark "Megger".
    Don Young
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