In article <[email protected] sys.net>, Donnelly, Thomas <[email protected]> writes > I am looking for information on cable shielding for a potential > Radiated Emissions problem. Unfortunately due to equipment > performance requirements we cannot filter the lines and must shield > the cables. > > I am looking for a source of information on the difference in > performance that can be expected using a single braided shield, a > double braided shield with no insulating layer between, or a double > braided shield > with an insulating layer between. We cannot meet the > emissions with a single shield and must use a second shield. We are > trying to determine what the effect of an insulating layer between > the shields on performance. We are trying to balance weight and > performance concerns and don't want to add the weight unless > required. > > All shields will be 95% optical coverage, and will be terminated on > both ends with a good quality EMI backshells.
What frequency? How are you grounding the shields (VERY IMPORTANT)? Are the circuits balanced or unbalanced? If balanced, what balun technique(s) are used? -- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk 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: Ron Pickard: [email protected] Scott Douglas [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
