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ADS1292R 信号是否需要滤波?

Other Parts Discussed in Thread: ADS1292R, ADS1292ECG-FE

我按照数据手册打完了ADS1292R的板子,主控用的是STM32F429单片机,现在编写完程序后,有以下问题:

1.程序设置采样率为250,然后测量DRDY的输出波形,结果失真,波形几乎是正弦波的上半部分,不是方波,而且频率为17.36MHZ,这是什么问题?

2.三个电极片直接连接到1292R的板子上,需要硬件或者软件进行滤波吗?