Conformity Magazine - March 2008 - (Page 42)

right choice of material for each, the designer needs to consider several factors, including the shielding performance required, mechanical considerations such as closure forces and tolerance build-up, whether the mating parts are dynamic or static, physical aspects (for example the material may be exposed to high shear or compressive forces), environmental concerns such as exposure to moisture and humidity, and perhaps resistance to extreme heat, including flame. [2] Thought should also be given to the manufacturability and ease of assembly of a particular shielding solution. This is especially true for devices produced in high volume; the trend for manufacturing to move to low labor cost countries in Asia, India and Eastern Europe is a clear indicator of the importance of reducing assembly costs to appliance OEMs. Shielding Material Options The EMI shielding materials appliance designers have at their disposal can be broken into different groups as follows: Metal Gaskets All-metal EMI gaskets have been in existence the longest. They are still relevant for a large number of applications, particularly in rack mounted equipment where individual circuits may need to be periodically removed and replaced. Beryllium copper (BeCu) fingerstock gaskets combine high levels of EMI shielding effectiveness with spring-finger wiping and low closure force properties. BeCu’s high tensile strength and superb electrical conductivity are ideal for shielding over a broad frequency range. Supplied in either standard or custom lengths for high volume applications, strips are available Figure 1: Metal fingerstock EMI gasket Figure 2: Elastomer gaskets 2 Conformity marCh 2008

Table of Contents Feed for the Digital Edition of Conformity Magazine - March 2008

Conformity Magazine - March 2008 NewsBreaks Editor's Note Adelstein Renominated to the FCC Industry Canada Publishes FAQs On RF Fields FDA Gives Its Scientific Capabilities Poor Marks FDA Offers Guidance On its Product Review Process FDA Publishes Updates to List of Recognized Standards FDA Warns of Patient Risk From Electric Dental Handpieces Complying with the EMC Directive, Second Edition ESD Open Forum Emerging Issues in Standards - Korean "RoHS": Not Like RoHS at All The iNARTE Informer Challenges in Testing - Field-Induced Charged Device Model: What Really Happens Design Fundamentals - EMI Shielding Technologies for Consumer Electronics Equipment Focus On...Compliance Software Buyer's Guide Additional Standards Published for the EU's ATEX Directive Additional Standards for the EU's Medical Devices Directive Also Published China to Require Bar Codes to Enhance Product Safety CPSC Releases 2007 Self-Assessment CPSC Actions in News IEC Standards Update UL Standards Update Product Reviews Telcordia Standards Update From Our "You Can't Make This Stuff Up" Department Looking Back: Items from Past Issues of Conformity Advertisers

Conformity Magazine - March 2008

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