诊断开关电源传导干扰的主要性质，分别测量共模干扰和差模干扰，是正确设计电源EMI滤波器的第一步。

It is difficult to design and build an effective power line EMI filter for switched mode power supply without distinguishing the differential or common mode component from conducted noise.

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共模干扰和差模干扰是传导emi的两种传导形式，本文从产生源、传播路径方面分别对共模干扰和差模干扰进行了论述。

CM and DM are the two conducted form of the conducted EMI, this paper discuss the CM and DM in the noises.

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共模干扰和差模干扰是传导emi的两种传导形式，本文从产生源、传播路径方面分别对共模干扰和差模干扰进行了论述。

CM and DM are the two conducted form of the conducted EMI, this paper discuss the CM and DM in the noise source and promulgated path.

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