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The dual-electrode mode does not get the correct ECG signal

Category: Hardware
Product Number: ad8232

There is no way to get the correct ECG signal, only a signal similar to noise

When an electrode is connected but not attached, the following waveform is obtained 

After attaching, different waveforms are obtained 

My schematic is based on Figure 62 of the manual, The homemade PCB is shown in the picture 

What is causing these problems, and is it the reason why I used the wrong electrode?

Expect a reply