I just bought this analogue insulation tester for testing compressors. I have a digital yokogawa insulation tester as well but I prefer an analogue tester. I wanted pointers on deciphering needle movement in an analogue meter. I have a compressor that is kinda loud but seems to be cooling ok. I do suspect some issue with it so tested it with both meters and with analogue the needle jumps to 20m ohm and falls back to infinity but with the digital one it just indicates OL on all three terminals on the compressor. I did get a 0 m ohm reading on one terminal once it never did it again.
How to do interpret readings of an analogue Megger is my first question and. Any pointers or article to on analogue readings.
Thanks