Hi Ed, Can you share with us some typical EMP caused defects, and their cause/fix ? Most of us do not share your experience in this....
Regards, Ing. Gert Gremmen Approvals manager ------------------------------------------------------------------------------------ + ce marking of electrical/electronic equipment + Independent Consultancy Services + Compliance Testing and Design for CE marking according to EC-directives: - Electro Magnetic Compatibility 2004/108/EC - Electrical Safety 2006/95/EC - Medical Devices 93/42/EC - Radio & Telecommunication Terminal Equipment 99/5/EC + Improvement of Product Quality and Reliability testing + Education Web: www.cetest.nl (English) Phone : +31 10 415 24 26 ------------------------------------------------------------------- This e-mail and any attachments thereto may contain information that is confidential and/or protected by intellectual property rights and are intended for the sole use of the recipient(s) named above. Any use of the information contained herein (including, but not limited to, total or partial reproduction, communication or distribution in any form) by persons other than the designated recipient(s) is prohibited. If you have received this e-mail in error, please notify the sender either by telephone or by e-mail and delete the material from any computer. Thank you for your co-operation. From: Ed Price [mailto:edpr...@cox.net] Sent: Wednesday 5 October 2016 00:22 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] When is EMI testing performed? Ken: Mostly, it was the fear that the system would fail EMP. We had no way of getting an exposure test any closer than 0.5% of the required level, so the risk of failure during the actual test was difficult to quantify, and this really frightens the program people. I would cajole best practices as strongly as I could, try to over-engineer what I could get away with, and closely look at cable routings and build quality, but I still was never sure what my odds were. A secondary reason was that scheduling an EMP test date was often longer than the rest of the environmental test program; the last couple of times, I had the hardware sitting around for over a month until the EMP testing was due. (And fortunately, both passed on the first try!) Ed Price WB6WSN Chula Vista, CA USA From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Tuesday, October 04, 2016 2:04 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] When is EMI testing performed? Ed, Was EMP last because it might break things, or because the EMP people wanted to see how the equipment fared after an accelerated life regime? Ken Javor Phone: (256) 650-5261 ________________________________________ From: Ed Price <edpr...@cox.net> Reply-To: Ed Price <edpr...@cox.net> Date: Tue, 4 Oct 2016 12:13:31 -0700 To: <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] When is EMI testing performed? In a military or space vehicle market, it was common for several systems to be moving in parallel through the environmental qualification test program. One system would often see rugged physical testing, where failures could be very serious setbacks (salt fog immersion, blowing rain, sand & dust, helium leak testing, solar exposure, transportation shock, drop testing, explosive shock exposure), while another system would be going through temperature cycling, vibration, and other more benign tests. This latter system would usually end up with me doing the acoustic noise and electrical tests (frequency & voltage extremes, power efficiency, start-up transients, and applicable powerline/EMC suite). I don't know how the reliability engineers factored in how one test affected another, but I do know that, although the sequence of tests before my lab wasn't always in the same order, the power & EMC tests were usually the last of the environmental suite. Further, if it was applicable, the NEMP exposure was the very last test. Ed Price WB6WSN Chula Vista, CA USA -----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. 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