我用NI-USB-6225数据采集卡同时采集两路信号，labview编程时使用的DAQ助手，但是不知道什么原因，两路不同信号的输入，采集到的数据竟然完全相同。比如，我硬件接的是AI0和AI1，那么这两个信号会完全一样。如果我硬件不变，软件中的channel换成别的通道，比如AI2和AI3，那么采集到的信号还是一样的（AI2和AI3没有接任何线）。并且当我AI0上接的信号发生变化时，AI2和AI3上面的信号也会相应发生改变，不知道什么原因？
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