I have a re-branded Mastech MAS345 DMM (Velleman DVM345DI) that is in need of a good cal, but I can't locate any reference materials for this [halfway-decent] meter. Lots of trim pots, but I've not yet become daring enough to just start twiddling them at random, since not every measurement type is blatantly out of cal.
Any experience in calibrating these (or any relevant instructions/procedures)?
Barring that, can anyone recommend a good trim-pot-twiddling strategy to determine what goes with what measurement?
JP
Cincinnati, OH
USA