Seems like a loaded question Patrick, but we can't "define" the variance of a product from the assembly line, we can only attempt to characterize it for each product. While we have few tools for predicting it before launch, an ongoing "lessons learned" database of audit results on similar products may give us a bit of insight.
Respectfully, Brent DeWitt > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of Conway, Patrick R (Houston) > Sent: Monday, July 02, 2007 7:47 PM > To: Grasso, Charles; Robert A. Macy; [email protected] > Subject: RE: Internal Margins for Emissions Testing > > That is a great answer, the best so far regarding statistical > nature of our field (pardon the pun). > Although not a fan of the measurement uncertainty cult > within our discipline, I understand the intention and support > the result. > > > It seems to me we are still missing 1/2 of the "statistical" picture. > Here is what I think - > (I could be whacked out here- so please view > this with a large portion of skepticism...) > I think the measurement "system" includes two items: > a) the measurement facility, and > b) the EUT. > > I think the "measurement uncertainty" does a good job of > defining quantity a). > But how do we define b), the variance of a product from > an assembly line? > > > The reason this is important to me is that I do not own, > operate or work in a test lab. > So the only part of the above equation I can influence > is the b) part. > (that is of course, assuming that there truly is two > parts to this "system", and I'm not whacked ) > (- THAT may be too much to assume!) > > Has anyone on this list performed measurement to understand > the statistical RF nature of the EUT? > I have not. > And I'm not sure how I would start. > > > > Best Regards, > > Patrick. > [email protected] > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of Grasso, Charles > Sent: Monday, July 02, 2007 5:37 PM > To: Conway, Patrick R (Houston); Robert A. Macy; [email protected] > Subject: RE: Internal Margins for Emissions Testing > > Sure there is! Its called measurement uncertainty! > > > Best Regards > Charles Grasso > Compliance Engineer > Echostar Communications Corp. > Tel: 303-706-5467 > Fax: 303-799-6222 > Cell: 303-204-2974 > Pager/Short Message: [email protected] > Email: [email protected] > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of Conway, Patrick R (Houston) > Sent: Monday, July 02, 2007 10:59 AM > To: Robert A. Macy; [email protected] > Subject: RE: Internal Margins for Emissions Testing > > <q> > Isn't there some 'statistical' justification for internal margins? > <q> > > Ooooh. Dangerous question!! > Remember what happened to Nicholas Copernicus when he > asked for proof. > He was told it was obvious and "it has to be so". > He was condemned by all the leaders of his > time, and for 100 years after. > (Except for Martin Luther- who only denounced him) > > > Wouldn't want that to happen to anyone on this list, so > be careful of asking heretical questions. ;) > (note smiley face) > > > Best Regards, > > Patrick. > [email protected] > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. 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