The white cardboard absorber does the job in concert with the underlying ferrite tile. I don't know their performance alone, but based on size they don't do much below maybe 400 MHz or thereabouts.
Ken Javor Phone: (256) 650-5261 > From: Ralph McDiarmid <ralph.mcdiar...@schneider-electric.com> > Reply-To: Ralph McDiarmid <ralph.mcdiar...@schneider-electric.com> > Date: Wed, 22 Nov 2017 17:56:05 +0000 > To: <EMC-PSTC@LISTSERV.IEEE.ORG> > Conversation: [PSES] Use of LED Spots in EMC Chambers [General Use] > Subject: Re: [PSES] Use of LED Spots in EMC Chambers [General Use] > > That's a great solution Ken. BTW, do those white cardboard pyramids absorb > much RF? > > Our old 3m chamber uses the blue foam pyramids only and four 60W ceiling > lights; fairly dark inside on a good day. And, the pyramids are held to > ceiling and walls with Velcro which doesn't really hold very well. > > Ralph McDiarmid > Product Compliance > Engineering > Solar Business > Schneider Electric > > > -----Original Message----- > From: Ken Javor [mailto:ken.ja...@emccompliance.com] > Sent: Wednesday, November 22, 2017 8:28 AM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] Use of LED Spots in EMC Chambers [General Use] > > One really excellent installation relied on the fact that the chamber was > ferrite tile-lined with an overlay of the white cardboard pyramids. Thus > didn't need nearly as much light as ferrite tiles alone or blue cones. LEDs > were outside the chamber, placed in the end of a plastic light pipe, which in > turn penetrated into the chamber through a waveguide-beyond-cutoff pipe. > All wiring and all noise outside the chamber. Brilliant white light within. > > Ken Javor > Phone: (256) 650-5261 > > > >> From: "Price, Andrew (Leonardo, UK)" >> <andrew.p.pr...@leonardocompany.com> >> Reply-To: "Price, Andrew (Leonardo, UK)" >> <andrew.p.pr...@leonardocompany.com> >> Date: Wed, 22 Nov 2017 12:00:46 +0000 >> To: <EMC-PSTC@LISTSERV.IEEE.ORG> >> Conversation: Use of LED Spots in EMC Chambers [General Use] >> Subject: [PSES] Use of LED Spots in EMC Chambers [General Use] >> >> Hi all. >> >> Has anyone had experience with using LED Spot lamps in EMC Chambers? >> What types/manufacturers would be recommended? >> >> Would appreciate help in trying to solve someone's problems with noise >> during radiated emissions. >> Test Facility has just had all their chambers converted to LED Spots >> and they are suffering broadband noise issues. >> >> Regards >> Andy >> >> >> >> >> Andrew Price >> Land & Naval Defence Electronics Division >> Prinicpal Environmental Engineer (EMC) >> >> Leonardo MW Ltd >> Sigma House, Christopher Martin Rd, Basildon SS14 3EL, UK >> Tel EMC LAB : +44 (0)1268 883308 >> Mobile: +44 (0)7507 854888 >> >> andrew.p.pr...@leonardocompany.com<mailto:andrew.p.pr...@leonardocompany.com> >> leonardocomapany.com >> HELICOPTERS / AERONAUTICS / ELECTRONICS, DEFENCE AND SECURITY SYSTEMS >> / SPACE >> >> * Please consider the environment before printing this email. >> >> >> >> >> ******************************************************************** >> This email and any attachments are confidential to the intended >> recipient and may also be privileged. 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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>
