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AMC1200输入电压问题

Other Parts Discussed in Thread: AMC1200

诸位,

    如下图所示,用AMC1200进行电压采样。在最左面的电压为0V时,测试AMC1200输入端,有8mV左右的电压。请问这个电压是怎么来的呢?是什么因素造成的?

多谢