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信号发生器给不给输入得到的值都如下图监测到的所示:
只开启了第7通道,输入不接信号发生器时也是差不多的这个值
不建议输入悬空,有可能会拾取噪声,但是悬空和给输入信号都得到相同的输出,也不正常。
这样,您将输入端直接短接到地,看下输出。