I am trying to measure 10Arms through current trunsformer with a shunt and a 2nd order lowpass differential butterworth.
I realized that when I try to measure the input with two oscilloscope`s probes with GND reference, the offset disappear. But when I measure just with one probe I get a DC component in my meassure.
I did the same with a vvoltage transformer measuring 10Vrms and I have not any issue.
Do you think that I need a load between the filter and the ADC input?