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ADS1292: ADS1292

Part Number: ADS1292

Hello, TI expert, I am not very good at English, so I used translation software, if there is any error, please understand, thank you.
I'm trying to measure three leads with ADS1292, but the test data isn't ideal

register configuration is as follows:

CONFIG1:0X01
CONFIG2:0Xa0

LOFF_STAT:0X40

CH1SET:0X20

CH2SET:0X20

There are the following questions:
1. In the actual test, I didn't connect RLD, only connect RA LA and LL at the same time,I can get a relatively good I-lead waveform, but it's hard to measure II-lead waveform, why ?

2,If I use only three electrodes(RA LA and LL) to connect to the human body, what are the improvements in this circuit?