经沟通排除参数设定错误、人为误判等情况，在客户依据标准规范要求，针对电源回路进行共模浪涌4级测试时，存在浪涌干扰时控制板出现异常现象，浪涌实验结束时异常现象同步消失。这说明系统板确实受到共模浪涌干扰。
图1 客户FTU系统电源方案
上图1为客户的FTU系统电源方案。如果按照我司常规对EMC的测试操作规范的理解，电源回路打浪涌则应用时在前端AC-DC电源模块端口进行，共模浪涌干扰的路径存在于L/N到PE的闭环路径上。
路径1：AC-DC内部L/N直接到PE；
路径2：通过L/N、AC-DC输出端、Y电容连到PE；
路径3：通过L/N、AC-DC输出端、DC-DC模块、控制板空间耦合到PE。
既然控制板受到影响，那么一定是通过路径3造成的影响。但AC-DC模块的耐压隔离分别为3000VAC和1500VDC，加上控制板与PE只能通过空间耦合，因此该问题明显无法直接判定根本原因。
进一步与客户沟通，发现标准所表明的电源回路其实包括输入、输出两部分，这与单个电源模块进行电源输入端的浪涌测试存在差异。客户就是在AC-DC电源输出端进行浪涌四级测试时，才出现的异常状况。
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