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Use of Metallic Enclosure for EMI Reduction By Vikas Shukla of Reference Designer FCC requires that any equipment that you plan to sell in USA can not exceed radiation beyond a certain limit. FCC classifies two categories of equipment - Class A and Class B. Class A equipments are meant to be used only in industrial places. They have less stringent limits on the radiation. Class B equipments have more stringent limits on radiaton. Class B equipments are those that can be used in home and offices. One of the ways for a equipment that would otherwise fail FCC test is to enclose it in metallic enclosure. Most of the personal computers will fail FCC test if they are are not enclosed in a metallic enclosure. Metallic enclosure should not have gaps in between them to be most effective. Ideally they should not be any slots or holes. The thickness of the shield is of secondary importance. The designers sometimes make a provision for the metallic enclosure in the begining of the design. Computational products with very high IO frequencies have more radiations and are more likely to fail in FCC tests. The metallic enclosures come at their rescue.

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Contributed by dehati on January 11, 2009, at 3:40 PM UTC.

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Reference Designer Tutorials referencedesigner.com

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