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ADS1299EEGFE-PDK: 配置PGA后信号没有放大

Part Number: ADS1299EEGFE-PDK
Other Parts Discussed in Thread: ADS1299

ADS1299开发板±2.5V供电,通道1正输入端输入峰峰值1V的180Hz正弦信号(蓝色线)。配置寄存器MISC1使SRB1作为通道1的负输入,并把SRB1接地(白色线)。

问题是在软件里配置4000SPS,PGA=2,但是信号并没有放大,请问该如何解决?