AMC1311做高压侧电压采样,采样后二次经过一小段电缆后经过放大器、片选后进入MCU。当MCU连接电脑进行DEBUG时,AMC1311二次电压有很大的震荡和文波,当断开电脑后正常。而电脑调试口已经通过ISO7421D做了隔离,电源也已经隔离。1311的一次电源也是隔离的,为何还出现这种情况呢,怎样处理较好。
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