Hi Jiahao, [quote userid="598300" url="~/support/data-converters-group/data-converters/f/data-converters-forum/1408578/ads1299-original-waveform-problem/5400266#5400266"]The band opens the BIAS, N terminal and P terminal on the head[/quote] I understand that the electrode inputs are connected to the individual P channel inputs and the N channel inputs are all connected to the reference electrode. I think you'll need to check the contact quality of the electrodes on the head, including the BIAS electrode. Can you try removing the diodes on the P and N inputs for one channel and compare the drift? Regards, Ryan
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