Hi Gary, Ted brought up a good point that for me has proven in a past life for a fairly benign EMC-passing product to produce a surprising comb generator effect that created a few headaches to deal with. Also, the EU's harmonized standards lists are regularly updated to indicate new/revised standard effectivity for a presumption of conformity. I use those lists as a means to keep products up to date regulatorily (sp?) speaking. And, keeping test reports and the DofC up to date keeps existing and prospective customers happy.
IHTH. Best regards, Ron From: McInturff, Gary [mailto:gary.mcintu...@esterline.com] Sent: Tuesday, May 29, 2012 11:09 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Statute of limitations Thanks Ted, John Woodgate suggested the same thing, and I hadn't thought about that aspect. Nice catch Gary From: Ted Eckert [mailto:ted.eck...@microsoft.com]<mailto:[mailto:ted.eck...@microsoft.com]> Sent: Tuesday, May 29, 2012 10:39 AM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Statute of limitations I've had a number of cases where an IC vendor did a die shrink on an IC without rescaling the pin drivers. Even though the IC ran at the same speeds, the edges were much sharper leading to problems at higher harmonics. I would suspect that a number of ICs in your system have undergone die shrinks. The IC vendors are always looking for ways to get more chips out of a single wafer. Ted Eckert Compliance Engineer Microsoft Corporation ted.eck...@microsoft.com<mailto:ted.eck...@microsoft.com> The opinions expressed are my own and do not necessarily reflect those of my employer. From: McInturff, Gary [mailto:gary.mcintu...@esterline.com]<mailto:[mailto:gary.mcintu...@esterline.com]> Sent: Tuesday, May 29, 2012 10:16 AM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Statute of limitations Is there any time limit on how long a test result is valid for an EMC test - if the product hasn't changed. CB reports have a 3 year shelf life, after which the various CB participants are obligated to take the reports on face value and could require inspection or retest, but I don't know if the same is true for EMC test when meeting the EU directives. Actually I guess the requirement for a CB update every three years isn't truly a requirement for meeting the directives either. The CB report is a tool to help show conformity. Bottom line the last EMC test was in 2004, and the clock speeds are pretty low - 12 MHz, so I don't think even the new upper frequency test range requirements of EN55022 affect the results. I'm inclined to test, the customer is not. Gary McInturff Reliability/Compliance Engineer Esterline Interface Technologies Featuring ADVANCED INPUT, MEMTRON, and LRE MEDICAL products 600 W. Wilbur Avenue Coeur d'Alene, ID 83815-9496 Office:208-635-8306 Cell: 509 868 2279 Toll Free: 800-444-5923 X 1238 gary.mcintu...@esterline.com<mailto:brian.s...@esterline.com> www.esterline.com/interfacetechnologies<http://www.esterline.com/advancedinput> Technology, Innovation, Performance... - ---------------------------------------------------------------- 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://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 <emcp...@radiusnorth.net<mailto:emcp...@radiusnorth.net>> 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. 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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://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 <emcp...@radiusnorth.net<mailto:emcp...@radiusnorth.net>> 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://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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
