Ed, Thanks for the tip have never installed one before. This is a 5 or 6 pin circular MIL-C-38999 style connector. Not really big, but not tiny, either.
Ken Javor Phone: (256) 650-5261 From: Edward Price <e...@jwjelp.com> Reply-To: Edward Price <e...@jwjelp.com> Date: Tue, 14 Aug 2018 20:31:13 +0000 To: <EMC-PSTC@LISTSERV.IEEE.ORG> Conversation: [PSES] X & Y Cap rating due to hipot test Subject: Re: [PSES] X & Y Cap rating due to hipot test Ken: I had some experience with using multiple EESeal connector EMI filters on a complicated Navy data telemetry system. One interesting thing about using these EESeals was that they made contact to each pin within a connector by having one or two tiny, thin gold leaf tabs extend from the EESeal silicon rubber ³sandwich.² When all the connector pins were in perfect alignment, and the EESeal was installed perfectly into a connector shell, the connector pins would firmly press those little gold leaf contacts against the EESeal¹s hole ID. This made a good, low-impedance connection between the connector pin and the EESeal¹s capacitor chips. IIRC, the EESeal body also had several little gold leaf tabs on its OD, in order to make a ground connection to the connector shell. I mention this in some detail because I found that when the connector pin alignment wasn¹t perfect, or the EESeal wasn¹t inserted nice and flat, it was possible to stress the little gold tabs. If you got an EESeal in place and then removed it (using Quell¹s approved method), you might (due to cost) be tempted to reinstall it later. I found that a microscopic examination of the EESeals sometimes disclosed missing gold tabs, or sometimes they had been ³balled up² against the hole ID wall. My point is that these are fragile components, and there is a possibility of misaligned gold tabs or even broken tabs being trapped between the connector insulation face and the EESeal silcon rubber body. This certainly frightens me from a reliability standpoint, as you can¹t see this from any visual examination of an installed EESeal. The installation of EESeals (the tiny ones were more troublesome than the big, multi-pin ones) must be done by tech¹s who understand the weaknesses of these marvelous gadgets, and who are willing to reject an assembly rather than ³make it fit.² And from an engineering viewpoint, your quality assuarance should cover the possibility of degradation arising from installing this type of device. Ed Price WB6WSN Chula Vista, CA USA -----Original Message----- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Tuesday, August 14, 2018 7:37 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] X & Y Cap rating due to hipot test No one knows about the eeseal. It's a possible EMI fix. I don't know were the 1000 V hipot test came from; I supposed it was insulation resistance/creepage-based. The point is, it is a dc requirement and the device will never see 1000 Vdc elsewhere, therefore it seems like an inappropriate requirement to place on a cap as a WVDC rating, and I don't see why it should be placed on an EMI filter external to the EUT. 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) <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> 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>
