megger
I am trying to test the rotor and stator on a Microlite 2.8. The service manual says to use a megger or the highest scale if not using a megger. Trying to test for a grounded rotor - manual says no...
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I work on mostly 480+ stuff and 1 meg would mean curtains for certain. In fact, already smoked! I want to see 10 meg minimum but I usually see close to 1 gig. $95 for 5 minutes work is great for the guy with the megger. A common DMM only measure resistance but a megger puts a selected voltage thru the circuit and measure insulation strength/leakage to ground. I gave up on ohmmeters for stuff like that decades ago. They usually got me into trouble. I tripped a power plant once cuz I didn't have a megger with me and I trusted an ohmmeter. They are not reliable for that at all. The first meggers I used were the hand crack Biddles that put out 5kv+ but about 20-30 yrs ago, it was decided it's bad to megger at a voltage that's very much higher than operating voltage so the newer meggers are voltage selectable. Craig
