I seem to recall that the military wants to see ambient scans with at least 6dB under any limit. Kind of a inside out measurement uncertainty?.
Michael Sundstrom OHD / TREQ Dallas Electronic Lab Analist, EMC Lead 2170 French Settelment Rd, Suite B Dallas, Texas 75212 (214) 579 6312 (940) 390 3644c From: lfresea...@aol.com [mailto:lfresea...@aol.com] Sent: Tuesday, August 10, 2010 12:07 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Calibration supplier for signal generator with pulse modulation HI John, just stressing Ken's use of the word unwarranted. I'm personally vehemently opposed to MU in EMC measurements: the reason why is that end to end even 10 dB is a trivial error... Just because the Stds committee says so does not make it warranted. All MU contributes is an academic exercise and lines pockets of individuals/organizations pushing it. We as an EMC community need to push back and say enough already. Our efforts are needed to address more important problems. Just for the record, Automotive EMC does not require MU, US Military to not require MU. If MU wasn't needed to put a man on the moon it sure as heck isnt needed in washing machines, computers etc. I'm guessing this is more than 10 cents worth! Derek Walton L F Research. From: John Woodgate <j...@jmwa.demon.co.uk> To: emc-p...@ieee.org Sent: Tue, Aug 10, 2010 11:46 am Subject: Re: Calibration supplier for signal generator with pulse modulation In message <c886e31f.841a0%ken.ja...@emccompliance.com>, dated Tue, 10 Aug 2010, Ken Javor <ken.ja...@emccompliance.com> writes: >Uncertainty for modulation parameters of depth or pulse on-off ratio >and time duration? Uncertainty applies to things like field intensity, >where the construction of the room or OATS and near field effects >combine to provide significant uncertainty. > >But something easily measured with an o'scope of modest (audio) >performance? That is a totally unwarranted extension of the concept. > Unfortunately, it isn't. The metrologists have inflicted formal uncertainty assessment on us and it's like death and taxes - always with us. Everything has to have its uncertainty assessed. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK If at first you don't succeed, delegate. But I support unbloated email http://www.asciiribbon.org/ - ---------------------------------------------------------------- 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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...@socal.rr.com> 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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...@socal.rr.com> 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.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...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>
