描述
使用时应注意的是除按图2进行接线外，还必须有对应的软件来配合，以实现Y000～Y003轮流导通；同时还要保证输入信号的宽度应大于Y000～Y003轮流导通一遍的时间，否则可能丢失输入信号。该方法的缺点是使输入信号的采样频率降低为原来的三分之一，而且输出点Y000～Y003不能再使用。
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