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0,2V Offset on DC Measurements with Picotest M3511A DMM
MaxH:
--- Quote from: MaxH on May 26, 2021, 11:07:54 am ---Apparently I measured the .2V from the OP Input against the "DMM Input GND" and to the test-pin, between the Input pins of the OP I have have 0V
I looked closer at the Input-Section or the "Input GND" path and there is Q209 which has the .2V Offset. If the "DMM + Input" is left floating I dont see those .2V (blue badly drawn line)
--- End quote ---
Late Update: The problem got mostly fixed by replacingh Q209, I also replaced U202 but Im not sure anymore if that was optional.
I seem to get correct measurements now but a slight offset when measuring open leads, I couldnt trace that back yet. Maybe its a wrong transistor type, I used a BC850
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