Does anyone know how to calibrate the Extech 382280? I have one that I bought not working. I have it repaired, however, the output is off. Such as, set it for 30.0V and get 30.1V. It works but not quite in spec. There are no pots to adjust so it must be software. It has an RS-232 interface that it will accept commands through. The manual omits any calibration commands but that has to be how it is done. Anyone have a clue?
Thanks,
Elrod