EMI Regulations

Government regulations in the US and many other countries prohibit electronic products from emitting EMI that could interfere with radio and television receivers. European regulations also include EMI immunity levels. Manufacturers of commercial electronic products generally contend with three types of EMI problems:

* Suppression of internally generated signals to prevent excessive levels of radiated and/or conducted emissions
The FCC in the United States, CSA in Canada, VCCI in Japan, AUSTEL in Australia, and legislation by EU (European Union) member countries all set certain standards for EMI emission levels that commercial electronic devices must meet before being sold in those countries. Many electronic products sold in the US must be tested and verified or certified for compliance with the FCC’s Part 15 regulations.

* External ambient interference with equipment operation
Many companies establish their own specifications for immunity to EMI over a range of phenomena. These may include electrostatic discharge (ESD), radiated immunity, and electricfast transients (EFT). This is not yet a requirement in the US; however, EU regulations currently do include immunity requirements.

* Internally generated emissions interfering with equipment operation
EMI from one circuit can interfere with the function of another within the same system or subsystem. Typically called cross-talk, this problem is the most common source of system susceptibility. Cross-talk frequently occurs in densely packaged mobile or portable equipment.
Design assistance that can make
a real difference in time and cost …
As the world’s largest manufacturer of EMI shielding materials, Chomerics offers its customers unparalleled knowledge of system design and regulatory compliance. We encourage you to contact our Applications Engineering Departments in Woburn or Marlow for practical advice on product selection. Featured in this catalog is Chomerics’ comprehensive product line for commercial applications. Since 1961, vigorous product development in pace with the rapid advances in electronics has made Chomerics a primary force in EMI shielding technology.
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Beryllium Copper Finger Strips and Industrial Enclosure Shielding