Hi Bob - Actually I did describe the converse: "Statistically - if your margin is better than the measurement uncertainty then you can guarantee 100% that the product under test passes. However, the further inside the uncertainty band your measurement is in, the lower the certainty"
Best Regards Charles Grasso Senior 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]; Email Alternate: [email protected] From: [email protected] [mailto:[email protected]] On Behalf Of Bob Richards Sent: Tuesday, July 19, 2005 11:45 AM To: ieee Subject: RE: EMC Ethics Charles, >>>Theoretically even if your measurement exceeds the spec but is inside the measurement uncertainty band - the test lab statistically is unable to definitively fail the EUT.<<< I agree. However, by that same logic if the measurement is *under* the spec but inside the measurement uncertainty band, the test lab is unable to definitively pass it. But, you did not say that, you said they could not fail it. As I said, "Nobody questions passing data!!!" :-) All this talk makes me wonder if our jobs are to see if we can pass it, or see if we can fail it. In my position, I would much rather be confident that something I passed should pass at any good lab. Cheers, Bob Richards, NCT 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 [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] 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 [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
