經溝通排除參數設定錯誤、人為誤判等情況，在客戶依據標準規范要求，針對電源回路進行共模浪涌4級測試時，存在浪涌干擾時控制板出現異常現象，浪涌實驗結束時異常現象同步消失。這說明系統板確實受到共模浪涌干擾。
圖1 客戶FTU系統電源方案
上圖1為客戶的FTU系統電源方案。如果按照我司常規對EMC的測試操作規范的理解，電源回路打浪涌則應用時在前端AC-DC電源模塊端口進行，共模浪涌干擾的路徑存在于L/N到PE的閉環路徑上。
路徑1：AC-DC內部L/N直接到PE；
路徑2：通過L/N、AC-DC輸出端、Y電容連到PE；
路徑3：通過L/N、AC-DC輸出端、DC-DC模塊、控制板空間耦合到PE。
既然控制板受到影響，那么一定是通過路徑3造成的影響。但AC-DC模塊的耐壓隔離分別為3000VAC和1500VDC，加上控制板與PE只能通過空間耦合，因此該問題明顯無法直接判定根本原因。
進一步與客戶溝通，發現標準所表明的電源回路其實包括輸入、輸出兩部分，這與單個電源模塊進行電源輸入端的浪涌測試存在差異。客戶就是在AC-DC電源輸出端進行浪涌四級測試時，才出現的異常狀況。
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