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Message: <blockquote data-quote="Gn96" data-source="post: 557096" data-attributes="member: 35894">It’s what a few people have said, basically the DNO supplier give us a reading of 0.10 incoming, the reading we get with the megger is 0.11, and the fluke is getting 0.05.  So the megger seems to be more “true”.Not sure if anyone uses the fluke 1662 series. But am I mistaken in how I’m interpreting the instructions in terms of zeroing the leads for loop impedance? All 3 leads need to be zero’s together ( if you try and zero two leads L-PE only on loop test the leads show >3100ohm) A few people have said they don’t zero for loop impedance on the fluke, but clearly states.</blockquote>