I believe Brian is correct here. If you follow the most recent spec (IEC 61000-4-4:2004) then you only have to perform tests on all lines at once common mode. BUT it would behoove each company to test the overall hardiness of their design on all the possible couplings (differential and common mode) to uncover any potential design issues.
Regards, Rodger From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of brian_ku...@leco.com Sent: Tuesday, May 16, 2006 9:49 AM To: emc-p...@ieee.org Subject: Re:RE: EFT/Burst Immunity Question To perform the test on all combinations doesn't take that much longer. As a corporate lab we have continued to test all combinations for the purpose of possibly finding a weakness in the design. If our product, by chance, passed the common mode test but failed when testing an individual line, we want to know about it. It is very likely that such a problem will show up in the field. Noise on the Power line is probably our biggest issue in the field. We test everything we can in as many modes as we can and we still, on occasion, will have a customer site where we struggle with some strange noise problem. My possition on this is, if you have the equipment, the means, and the time, test it! Brian ____________________Reply Separator____________________ Subject: RE: EFT/Burst Immunity Question Author: vef00...@nifty.ne.jp List-Post: emc-pstc@listserv.ieee.org Date: 5/16/2006 9:26 AM On Tue, 16 May 2006 10:27:30 +0300, <ari.honk...@nokia.com> wrote: > If you follow the latest IEC 61000-4-4 it is only common mode test, that > is L1,L2,PE. It is quite clear in IEC 61000-4-4:2004, as the clause 7.3.1.1 of the standard now says: The test voltage shall be applied ***simultaneously*** between a ground reference plane and all of the power supply terminals ... and the corresponding figures also indicate that the disturbance are to be injected to all lines at once. However, IEC 61000-4-4:1995 clause 7.3.1 simply says: The test voltage shall be applied between a ground reference plane and each of the power supply terminals ... and the corresponding figures suggest that the disturbance are to be injected to each of the lines one by one. Regards, Tom Tomonori Sato <vef00...@nifty.ne.jp> URL: http://homepage3.nifty.com/tsato/ - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.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...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.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...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.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...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
