Hi Ryan, I shorted IN1N and IN1P and connected them to AGND through one terminal of JP5. This is the waveform I measured. My PGA gain is set to 1 at this time. According to the instructions in the data sheet, the offset should be about 600uV, which is reasonable. However, the square wave signal I measured before has a deviation of 1.5mV from the actual value, which still confused me. I removed all jumpers on JP25. I don't know where the offset will be introduced again. Many thanks Junzhe
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