Hi Ken, Interesting question.
I've never seen a product intentionally scheduled at the end of environmental qualification for the specific purpose of assessing EMI performance after it's been physically abused after all the other qual testing. But I have heard some program managers say EMI testing should go at the end because the product will get beat up in the field and it should still perform under those circumstances. But they never followed through to put EMI at the end because many considered EMI the hardest to pass and everyone wants to pass qualification - so it ends up near or at the front of the queue for EMI. When I was an EMC/EMI design & test engineer for 2 major manufacturers, typically the product hardware scheduled for qualification tests had to be shared among EMC/EMI, Safety, environmental testing, and any other miscellaneous tests. This was primarily due to cost, the products I worked with at the commercial manufacturer cost thousands of dollars, and at the military defense contractor the products cost hundreds of thousands of dollars. So I do understand the sharing concept. Nevertheless, whenever the opportunity arose for me to have a voice in the matter I always pushed for receiving the product first for EMI testing. There's been a few times when I received product hardware for EMI testing that was so banged up I had to refuse testing it because it was certain to fail some of the EMI tests. Most program managers accommodated my request to be at the front of the test queue because they wanted the product to pass the myriad of EMI tests it had to undergo (which many viewed as very mysterious testing). However sometimes this strategy didn't work when there was an EMI emissions or immunity failure, which then caused a delay in the overall test schedule for the next suite of qualification tests. Providing more samples for testing would help alleviate this but then there's the cost issue to deal with. Manny Barron EMC/EMI Engineer -----Original Message----- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Tuesday, October 04, 2016 7:35 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] When is EMI testing performed? Have any of you ever seen EMI qualification intentionally scheduled at the end of environmental qualification for the purpose of assessing EMI performance after the suite of environmental tests has taken its toll? Thank you, Ken Javor Phone: (256) 650-5261 - ---------------------------------------------------------------- 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> - ---------------------------------------------------------------- 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>
