Hi Ian Assuming that you are mainly working from 30 MHz to 1 GHz the shielded tent material will give you reasonable performance, more than 30 dB. The big issue will be how you get cables in and out. The shielding effectiveness will easily fall to 20 dB or even 10 dB. Of course, any shielded room, however expensive, with a penetration panel that does not properly terminate cables passing through the bulkhead will not perform any better. The other big issue is the door which I assume will not have high performance because of inadequate bonding around the mating surface. This will also negatively impact on SE. A good mains filter well bonded to the shield will also be a requirement. You can wrap the shielding material around the shielded cables giving some attenuation of the surface currents. Internal reflections will be uncontrollable without absorber. Any tests carried out will have to be repeated outside. Good luck. John McAuley www.cei.ie <http://www.cei.ie> john.mcau...@cei.ie <mailto:john.mcau...@cei.ie> ***************************************************************** DISCLAIMER: The information contained in this e-mail may be confidential and is intended solely for the use of the named addressee. Access, copying or re-use of the e-mail or any information contained therein by any other person is not authorised. If you are not the intended recipient please notify us immediately by returning the e-mail to the originator ________________________________
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of McBurney, Ian [Allen & Heath UK] Sent: 12 February 2010 13:52 To: emc-p...@ieee.org Subject: Shielding tents Dear colleagues. Does anyone have experience of using a Faraday/rfi screening tent for EMC emission measurements from products 1.5m x 1m x 0.5m? In particular; how effective are they in reducing external ambient emissions and are internal reflections from the EUT a problem. How do cables enter & exit the tent. I would appreciate some comments as I am considering purchasing one for pre-compliance 3m radiated emission measurements. Ian McBurney. Allen & Heath Ltd. email:ian.mcbur...@allen-heath.com P Please consider the environment - do you really need to print this email? ***LEGAL DISCLAIMER*** This Email and any files transmitted with it are confidential and intended solely for the use of the individual to whom or the entity to which they are addressed. If you have received this email in error please notify the sender immediately. Please note that any views or opinions presented in this email are those of the author and do not necessarily represent those of Allen & Heath Limited. This email has been checked for the presence of viruses using Sophos AV Scanner. Anti-virus updates are downloaded on a daily basis . The recipient should also check this email and any attachments for the presence of viruses. Allen & Heath Limited accepts no liability for any damage caused by any virus transmitted via this email. This email has been sent from Allen & heath Limited, registered in England, reg. no:4163451. VAT Number GB 876 3336 94. Registered Address: Kernick Industrial Estate, Penryn, Cornwall. UK. TR10 9LU. *** - 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...@socal.rr.com> 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...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>
