The grounding of the shield of your antenna cable simply should be considered mandatory.
There is no way you can exclude environmental (radio) signals to leak in otherwise, and there is no way of preventing high power immunity test signals to leak out. With leaking I mean at the attenuation will be less then 6dB or so. A cage of faraday with the shield broken this way will have its shielding effectiveness drop from over 100 dB to 3-4 dB at its best. Whether you use bulkhead connectors , or other means to ground the shield, keep in mind that the only place you should do the grounding is exactly at the physical boundary of the chamber. A few cm of cable run outside or inside between ground and pass through will have the same effect as above, possibly limited to higher frequencies. Feel free to elaborate on this topic if you think you need to. Gert Gremmen Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens cmander...@micron.com Verzonden: dinsdag 13 januari 2009 22:50 Aan: emc-p...@ieee.org Onderwerp: Anechoic Chamber: Pass-through vs. Bulkhead EMC Gurus, We have a Space Saver chamber that we bought used and installed ourselves. When we installed it, we ran our antenna (signal) cabling through a pass-through along with our fiber optics. Today, someone mentioned that we ought to have at least our antenna cable connected through a bulkhead so that the cable shielding was terminated on the chamber. When we went to disassemble the chamber when we bought it, there were no bulkheads for anything. Are the bulkheads necessary? Does anyone else use a pass-through for the antenna cable? It doesn't seem to have had an effect on measurements, but I still have a lot to learn so hopefully someone can share some wisdom. Thanks, Chris Anderson - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>
