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ADS1299: Cannot get a clean test signal from channel 2-8

Part Number: ADS1299

Hi Ti team,

I'm using ADS1299IPAGR to acquire EEG signal. However, I found when I set my ADS1299IPGR all channel  register CHnSET to 0x05(test signal). There is only one channel without noise.

8 channels data has been parsed in matlab as below.

I just don't understand why can't I get clean signal from the channel 2 - channel 8 like the channel 1.

Can you guys help me?

Thanks,

Jazel