I echo Ken's suggestion. The Other Brian
From: [email protected] [mailto:[email protected]] On Behalf Of Ken Javor Sent: Friday, December 16, 2011 6:04 PM To: [email protected] Subject: Re: Semi-Anechoic Chamber Question Since it's a pre-compliance scan, why not just leave the floor absorber in place, use a fixed receive antenna height, and add 4-6 dB (or whatever number is deemed appropriate) as a worst case adjustment factor? Ken Javor Phone: (256) 650-5261 ________________________________ From: Jim Hulbert <[email protected]> Date: Fri, 16 Dec 2011 16:48:51 -0500 To: "[email protected]" <[email protected]> Conversation: Semi-Anechoic Chamber Question Subject: Semi-Anechoic Chamber Question I have an older 3-meter semi-anechoic chamber that is fully compliant for radiated immunity testing per IEC 61000-4-3. Occasionally I also use the chamber to run a radiated emissions "pre-scan". When I use the chamber for the pre-scan up to 1 GHz, I remove the foam absorbers and ferrite floor tiles between the antenna and EUT to get a reflecting ground plane. The aborbers are no problem but the floor tiles are quite heavy. As an easier option, I'm thinking of coming up with a relatively light weight conductive surface that can be easily placed over the floor tiles and easily removed again. Something like a foil that could be rolled into place and then rolled up again when done. I could connect the foil to the shielded room floor to ground it. Does anyone have any experience doing something like this or would I be wasting my time and better off continuing my practice of removing the tiles? I'm not looking for compliance emissions measurements because I'm limited to 3 meter distance and an antenna sweep height of 3 meters. However, I would like to get the best pre-scan data I can to minimize surprises when I do go out to an open area test site for the final test. Thanks. Jim Hulbert - ---------------------------------------------------------------- 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> - ---------------------------------------------------------------- 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 <[email protected]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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 <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[email protected]>> ________________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
