Crosstalk between PPG and ECG

MaHofMaHof Deutschland

Hi, I am working on a project with an experimental ECG Setup and am having some issues with recording PPG and ECG data at the same time (I need both for comparison). There seems to be a crosstalk between the pulse sensor Gnd and the ECG bias that is affecting my measurements.
Is there any way to measure PPG and ECG at the same time and reduce this crosstalk? Or is it a Hardware problem that I can't fix anyway?

Another short question about the Bias. Is its output (like a RLD) calculated from all Input Pins I use?

Thanks in advance for your help.

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