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ads1292R右腿驱动是否必须连接?

Other Parts Discussed in Thread: ADS1292R

我使用ads1292R做了一块板子,也能得出心电波形,但是关于这个右腿驱动有些问题。测量心电是右腿驱动是不是必须接的?我分别作了接与不接的波形,发现都能画出心电波形,但是读出的数据却发生很大变化,具体如下:

1,接右腿驱动时对应波形及部分数据

     

2,不接右腿驱动时对应波形及部分数据

      

求解答,谢谢