Re: [PSES] MIL-STD-461G testing survey question
Ken: I seem to have misplaced my lab sometime in the past two years, but I switched to field probes long ago. I feel that receive antennas distort the field by their very presence, and their alignment is very critical. Given how field probes have been successfully automated, I think this is the only way that RS103 should be conducted. Ed Price WB6WSN Chula Vista, CA USA -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Monday, June 16, 2014 2:56 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] MIL-STD-461G testing survey question Greetings, The DoD Tri-Service Working Group drafting MIL-STD-461G is interested in how EMI test facilities such as your company perform RS103 above 1 GHz. RS103 offers two alternatives (MIL-STD-461F, RS103 sections: 5.20.3.3.d 5.20.3.4.c ). A field probe can be used just as below 1 GHz, or A DRG horn such as used for RE102 above 1 GHz can be placed over the ground plane where the test sample will be situated, and the field intensity can be pre-calibrated, and then pre-recorded drive levels played back during actual susceptibility testing. The latter procedure was included in MIL-STD-462D back in 1993 because at that time probes operating to 18 GHz were new and not every test facility had one, and there was a desire to minimize new equipment requirements as much as possible. The question, twenty years later, is whether this grandfather clause is still relevant, or is everyone using field probes over the entire test frequency range to 18 GHz? Please respond as to how your company performs this test. Thank you for your time, Ken Javor, Industry Representative to MIL-STD-461 TSWG 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 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
Re: [PSES] RE2: [PSES] Television Manufacturing Documentary From The Late 1950's - YouTube
Is DFT obsolete? I say this from an experience I had maybe 7 years ago. My company made aircrew emergency locator beacons and transceivers for the military market. These were not designed for test at all; they were designed to work without any level of manufacturing test. We received an emergency request to quickly supply many more units, but the just-in-time supply chain was not flexible enough. We went to the rather small trash bin where we had been collecting the few units that failed their final (and only) test for whatever reason. We assigned several bodies (me included) to finding the faults and fixing them. It was terrible work; there were no test points, the boards were multi-level and the traces looked more like a moiré pattern. I was struck that the manufacturing process quality was so high that a failed unit was rare, but fixing a failed unit needed heroic effort. Ed Price WB6WSN Chula Vista, CA USA -Original Message- From: Brian Oconnell [mailto:oconne...@tamuracorp.com] Sent: Monday, June 16, 2014 9:59 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] RE2: [PSES] Television Manufacturing Documentary From The Late 1950's - YouTube My love affair with Tek scopes from that era continues. I have two at home. And one in the safety lab, which drives the boss crazy, thus making its retention all worthwhile... The level of test is probably an order of magnitude greater than that era, but perhaps noticed less because most test is automated and most stuff is designed with test in mind (remember the old DFT push?). As for commercial product transport tests - very common and some of these tests are fun to do. Also, in addition to the ANSI and ASTM and IEC stuff, the major carriers also publish specs and profiles and tests for packaging based on a well-defined transport environment. Brian - 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 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
Re: [PSES] MIL-STD-461G testing survey question
Agree with Ed. Also, ccan't reflected RF from the measurement horn affect SWR (ad FS) in the transmit side? I could see a small enough antenna used to verify FS for manual testing, however; I've had to move a horn close enough to equipment to recreate failures just to troubleshoot things. Cortland Richmond -Original Message- From: Ed Price edpr...@cox.net Sent: Jun 17, 2014 9:14 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] MIL-STD-461G testing survey question Ken: I seem to have misplaced my lab sometime in the past two years, but I switched to field probes long ago. I feel that receive antennas distort the field by their very presence, and their alignment is very critical. Given how field probes have been successfully automated, I think this is the only way that RS103 should be conducted. Ed Price - 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 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
