We use two electrode AC leads off detection for circuit configuration and using two-pole, high-pass filter, and two-pole, low-pass filter. (Frequency response range is 0.05hz to 40Hz)
Measuring the system noise that is around 100uV(clause IEC 60601-2-47 220.127.116.11.106 system noise < 50uV).
Does someone help us to reduce system noise ?
The picture is our design value.