电磁兼容入门(英文版)2.ppt

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电磁兼容入门(英文版)2

Table below shows both the Class A and B conducted emission limits, these voltages are measured common-mode on the ac power line using a 50Ω / 50uH line impedance stabilization network (LISN) as specified in the measurement procedure. Fig. below shows a typical FCC-conducted emission setup. A device not only be tested for compliance with the technical standards, but also be labeled as compliant, and information must be provided to the user on its interference potential. In addition to the technical specifications, the rules also contain a noninterference requirement which states that if use of the product causes harmful interference, the user can be required to cease(停止) operation of the device. Notice the difference in responsibility between the technical specification and the noninterference requirement. In addition to the initial certification of a product, the rules also specify that the manufacturer is responsible for the continued compliance of subsequently manufactured equipment. If a change is made to a compliant product, the manufacturer has the responsibility to determine whether that change has an effect on the compliance of the product. The FCC has cautioned manufacturers to note that many changes are in fact very significant. Thus a change in the layout of a circuit board, or the addition or removal or even rerouting of a wire, or even a change in the logic will surely change the emission characteristics of the device. Whether change in characteristics is enough to throw the product out of compliance best be determined by retesting. Principal Techniques to Achieve EMC EMI Analysis 1. Conducted Coupling Conducted coupling occurs when the path of interference between the source and the receptor is formed by a conducting body. This kind of coupling can be by means of a power cord, interface cables, ground returns, or unintentional external conductors such as metallic cases. 2. Radiated Coupling Radiated coupling occurs when the path

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