In another life I tried the 60cm absorber for the S-VSWR test and had major problems around 1-2GHz, in the end they were replaced with larger absorber. The issue was the ground and ceiling reflection between the two antennas wasn’t being properly attenuated by the smaller cones (looking back it made sense thicker absorber = more attenuation but at the time you’re working almost blind). For the 16point cal the distance between the absorber and the isotropic probe also caused a problem as it skewed the original results. (You need to keep the 16point cal positions away from the absorber, in a small chamber this can be tricky and a compromise takes time, lots of time)
Hope this helps Rich From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: Thursday, August 27, 2015 4:28 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Floor Absorbers for S-VSWR and 61000-4-3 Field Uniformity We purchased our absorber material many years ago now, so things maybe different than it was then. We were told that the absorber material most labs were using for 61000-4-3 testing above 1Ghz was “Too Tall” to be used for S-VSWR verification. So we worked with TDK who recommended a shorter absorbing material which should meet both requirements. Though we purchased and use this material and get good unified field data for 61000-4-3, we have never tested this material in the S-VSWR verification setup. Someday when we expand our radiated emissions testing above 1Ghz we will find out. So bottom line, I recommend working with an absorber manufacture to help you find a material that will meet your specific needs. Hope this information was helpful. The Other Brian From: Grace Lin [mailto:graceli...@gmail.com] Sent: Thursday, August 27, 2015 4:07 PM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Floor Absorbers for S-VSWR and 61000-4-3 Field Uniformity Dear Members, Does anyone have an experience using the same type/model of the absorbers to meet both S-VSWR and 61000-4-3 field uniformity requirements? I was told different type/model of the absorbers must be used. Is this true? Thank you very much. Best regards, Grace Lin - ---------------------------------------------------------------- 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<mailto:emc-p...@ieee.org>> 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://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org<mailto:sdoug...@ieee.org>> Mike Cantwell <mcantw...@ieee.org<mailto:mcantw...@ieee.org>> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org<mailto:j.bac...@ieee.org>> David Heald <dhe...@gmail.com<mailto:dhe...@gmail.com>> ________________________________ 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 <emc-p...@ieee.org<mailto:emc-p...@ieee.org>> 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://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org<mailto:sdoug...@ieee.org>> Mike Cantwell <mcantw...@ieee.org<mailto:mcantw...@ieee.org>> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org<mailto:j.bac...@ieee.org>> David Heald <dhe...@gmail.com<mailto: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.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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
