I guess the equipments in Apollo project hasn’t only pass the tests with no margin J They may have required quite a big margin so MU is not an issue at all…
Commercial world can be quite a bit different in that matter. They can’t afford 10 dB margin. Has anyone seen a consumer electronic product will pass 10 dB Class B emission limits ? I believe a proper measurement uncertainty assessment will decrease the different measurement / test results between accredited laboratories for the same product. Then, manufacturer / designer will not shop for a laboratory which he / she will get an easy pass test report. OOO (Own opinions only) Best regards, Deniz Demirci National Technical Systems (NTS Canada) Phone: 403-568-6605 ext 244 fax: 403-568-6970 email:deniz.demi...@ntscorp.com web: http://www.ntscorp.com/about/locations <http://www.ntscorp.com/about/locations> From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of lfresea...@aol.com Sent: Tuesday, August 10, 2010 11:07 AM To: j...@jmwa.demon.co.uk; emc-p...@ieee.org Subject: Re: 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. 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