Megohm meter has incorrect test voltage

摘要

I have just completed building the Digital Megohm & Leakage Current Meter from scratch. When turned on for the first time the LCD showed the correct dialog etc and all looked fine. I connected the test wire and commenced the setting-up process and the 1000V reading showed 103μA. Not to be out-done I adjusted the trimpot but this had no effect on the reading.