shifting polarity ECG ? [resolved]

SumangalaKHSumangalaKH India
edited October 2021 in Ganglion

I am using Ganglion board (3 leads on 4th channel) and have followed the connections as per the OpenBCI Ganglion ECG Setup Documentation for ECG Signal. The electrodes connected to wrist as per the video i,e Channel-4 positive electrode to left wrist position. D_G and channel-4 negative electrode connected to right wrist position.
Observed that R peak is switching between positive polarity to negative polarity and vice versa.
Please let me know possible causes for the behaviour



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