Could there also be various high frequency sources within the lamps themselves which would are not filtered by the filters external to the chamber (and the lamps may not have properly shielded bodies and/or lenses)?
John E Allen W.London, UK From: John Woodgate [mailto:j...@woodjohn.uk] Sent: Wednesday, November 22, 2017 12:10 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Use of LED Spots in EMC Chambers [General Use] It's hardly surprising, is it? These lamps are not designed for the very special EMC environment of test chambers. Lamps using a DC supply are indicated, but the DC supply itself must be specially filtered and installed outside the chamber. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk> Rayleigh, Essex UK On 2017-11-22 12:00, Price, Andrew (Leonardo, UK) wrote: 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> <mailto: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. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ******************************************************************** - ---------------------------------------------------------------- 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 <mailto:emc-p...@ieee.org> <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 <mailto:sdoug...@ieee.org> <sdoug...@ieee.org> Mike Cantwell <mailto:mcantw...@ieee.org> <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <mailto:j.bac...@ieee.org> <j.bac...@ieee.org> David Heald: <mailto:dhe...@gmail.com> <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 <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>
