Ken Javor <[email protected]> wrote (in <bf4f5626.2c1f5%[email protected]>) about 'When is a cable shield not a cable shield?', on Thu, 15 Sep 2005:
> The reason for terminating the shield at both ends at high frequencies >(cable electrically long) is to contain the eddy currents on the >interior of the equipment enclosure, of which the shield is an >extension, just as a tunnel or skyway between two buildings becomes an >extension of the buildings it connects. It's better to keep the eddy currents to the OUTSIDE of the enclosure, because if they flow on the inside, they can radiate into internal circuits. This can be achieved by using metal-shelled free connectors with 306 degree contact with both the cable shield and the shell of the mating fixed connector which is attached to the outer (conducting) surface of the enclosure. -- Regards, John Woodgate, OOO - Own Opinions Only. Deadlines are 90% of deadliness. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk - 2005 IEEE Symposium on Product Safety Engineering 3-4 October Schaumburg, IL http://www.ieee-pses.org/symposium This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
