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之前用的时候都会正常的输出一致，后面就变成输出不一致了。
原理图如下：
信号源标准输出的，输入波形 正弦波 频率100Hz 1Vpp,输入波形的图没有了(确定输入波形一致)。测试的R32、R35左端。2通道蓝色为正常波形
