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Loop Impedance Tests

Northern Spark

I did a loop impedance test today at a garage socket with ATT on and got a measurement of about 250Ω, I did it again without ATT and measured about 2.5Ω. I have noticed small discrepancies before, but never on this scale. I did repeat the tests, and am fairly sure I was reading the display properly! The house is PME, presumable exported to the garage. I didn’t have time to investigate further, and am going back on Monday so can look into it further then. I am wondering what could cause such discrepancies. My meter has fairly new batteries in it.

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    Two different tests on Kewtech testers, high current measurement is the loop impedance whilst the low test measures is the loop resistance and as Mike pointed out the difference in the current makes a big difference. 

    I have too many test meters, including six I can use for loop testing, my wife can't understand why some are not being sold on Ebay!

    When I bought the last one, a Megger 1741, I phoned the Megger technical team to ask about a setting and said I should sell a few older testers, I was advised to keep some of the others as they all work in different ways and sometimes one will work better than another!

    I have had the same conversation on trade stands at shows.

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  • 0

    Two different tests on Kewtech testers, high current measurement is the loop impedance whilst the low test measures is the loop resistance and as Mike pointed out the difference in the current makes a big difference. 

    I have too many test meters, including six I can use for loop testing, my wife can't understand why some are not being sold on Ebay!

    When I bought the last one, a Megger 1741, I phoned the Megger technical team to ask about a setting and said I should sell a few older testers, I was advised to keep some of the others as they all work in different ways and sometimes one will work better than another!

    I have had the same conversation on trade stands at shows.

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