How to acquire data from ECG out port?

[HampholRE]

How do I measure the signal with an oscilloscope? I connect it to the ECG output along with the reference and I get a somewhat erratic signal, it is barely different from a conventional ECG signal. Does the output (ecg out) provide the ecg values ​​in analog?

[parkchanwu]

Could you tell me how you managed to connect successfully? Currently, the nRF52 DK and S1 kit are connected, but the firmware flashing process encountered an error.