> -----Original Message----- > From: John Woodgate [ mailto:[email protected]] > Sent: Monday, July 18, 2005 10:41 PM > To: [email protected] > Subject: Re: EMC Ethics > > Robert A. Macy <[email protected]> wrote (in > <[email protected]>) about 'EMC Ethics', on Mon, 18 > Jul 2005: > > >One of my EX-Clients rather than fixing the problem would > "shop" test > >labs. The client compared results from each lab and found a "dead" > >test lab and used it to get passing data. > > I doubt you could do that in UK or Germany; the surveillance > from the accreditation services is far too aggressive. > > > >I've always told my clients that not passing with good margin merely > >points out that the design is "out of control". > > There are some situations where the test results are > inherently wildly variable for well-understood reasons. An > example is the mains harmonic emissions from single-phase > rectifiers with capacitive filters.
John: Would you start another thread and explain a bit about what & why those harmonic emissions are so variable? Ed Price [email protected] WB6WSN NARTE Certified EMC Engineer & Technician Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military & Avionics EMC Is Our Specialty ---------------------------------------------------------------- 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
