Amund: Why not minimize the uncontrolled variables by renting an LISN from a lab equipment supply house?
Ed Price WB6WSN Chula Vista, CA USA From: Amund Westin [mailto:am...@westin-emission.no] Sent: Wednesday, July 01, 2020 10:58 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] SV: [PSES] Conducted emission - AC line filters makes it worse I will try to get access to the product next week and do my own measurements for conducted emission (generic light industry limit). The lab does only offer me a spectrum analyzer and a current clamp for measuring / troubleshooting. Not a LISN. From the book «EMI troubleshooting techniques», Michel Mardiguian, there is a way to measure CM and DM noise with a current clamp. I’m planning to follow that procedure and do some initial measurements, and then repeat the measurements after modifications. Assume that improvements and lower levels under these measurements, will also be reflected when later on doing this with a LISN. Anyone who have tried such troubleshooting technique? Best regards / Mit freundlichen Grüßen / Mvh Amund Westin ********************************** Cell: (+47) 920 17 031 E-mail: am...@westin-emission.no<mailto:am...@westin-emission.no> ********************************** Fra: Grasso, Charles [Outlook] Sendt: 29. juni 2020 16:40 Til: EMC-PSTC@LISTSERV.IEEE.ORG Emne: Re: [PSES] Conducted emission - AC line filters makes it worse Hi – This IS an interesting problem! My question: Is the 3 –phase configures as a delta or a wye configuration? Also – What is the AC device (power supply/motors etc..) [Working From Home] Charles Grasso Crackpot Theorist Dish Technologies (c) 303-204-2974 (h) 303-317-5530 (e ) charles.gra...@dish.com<mailto:charles.gra...@dish.com> (e2) chasgra...@gmail.com<mailto:chasgra...@gmail.com> From: Patrick <conwa...@gmail.com<mailto:conwa...@gmail.com>> Sent: Sunday, June 28, 2020 9:50 AM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Conducted emission - AC line filters makes it worse This message originated outside of DISH and was sent by: owner-emc-p...@listserv.ieee.org<mailto:owner-emc-p...@listserv.ieee.org> Hi Amund This sounds like a very interesting problem. Likely many people will have advice. Maybe get lucky and someone will have had this exact same problem. I'd like to help if I can. Do you have more information on the failure? What test standard and test method did you use? How much over the limit? What filters were used and how were they connected? It could be an installation of good filters, but not wired for the emission type. Also could be wrong filter type for problem? Very interesting. On Sun, Jun 28, 2020, 2:58 AM Amund Westin <am...@westin-emission.no<mailto:am...@westin-emission.no>> wrote: A 3-phase product has three internal AC driven devices. The product fails on Conducted emission. When connecting AC filters to each internal AC driven devices, the emission gets even worse. Any clue about this phenomena? Is it some kind of impedance mismatch which derate the filters performance? BR Amund - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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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<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<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>
