Is there a way to adjust the 600 Amp DC range indication to be at or near zero when there's no wire or nearby field present? Mine reads 23 ("0023") Amps!
The 40 Amp range has some residual, but it's down around 10 or 20 ma., and not a concern for my use.
I know I can, and I do, use the "relative" function to zero the meter; however, if I could get the 600 A range residual to be zero, or even just a few Amps, it would be small enough that I wouldn't have to use the relative function every time.
https://www.eevblog.com/forum/testgear/uni-t-ut204-clamp-meter-review-and-tear-down/msg173557/#msg173557 has a link to the schematic (Reply #23) and a list of the variable resistors (Reply #2), but as far as I can tell none of the latter are for zeroing the residual indication on the 600 A range.
The "23" is rock-solid and repeats every time the meter is turned on. It also adds to the actual current in the positive direction, and subtracts from the current in the negative direction. I wonder if it's being caused by an errant fixed component rather than a variable control that needs resetting.
I've opened the case but haven't yet done any close inspection/testing along these lines.