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ADS1298 leadoff 用上拉电阻模式,直接超量程

各位大神,

1298用评估板测试,设置leadoff检测为pull-on/pull-down,波形为0.4v直线

用其他设备直接读取数据,为0x7FFFFF的削顶波形,逐渐趋于直线,用current检测,正常。

测试通道CH2,CH3,接四肢。

求告知原因。

还有,这个1298的lead off检测功能实在是不怎么会用,求指导。