If it's USA automotive testing, most all aspects are quite well dictated. - Bill In the event of a national emergency, click on the following links to provide directions to your duly elected mis-representative. http://www.usa.gov/Contact/Elected.shtml or... https://writerep.house.gov/writerep/welcome.shtml http://www.senate.gov/general/contact_information/senators_cfm.cfm
________________________________ From: Ken Javor <[email protected]> To: [email protected] Sent: Wed, May 26, 2010 4:38:35 PM Subject: Re: [PSES] Radiated emission testing for automotive at low levels. Clearly you will get slightly different answers if using different BWs. I'm not sure what the difference between a 3 and 6 dB BW filter is, in terms of the total noise power underneath the curve. It will depend on the shape factor of the IF filter. But the difference between 3 dB, 6 dB and impulse BWs should not make a whole lot of difference, a couple dB at most. I know that's huge for you uncertainty types out there, but for those of us in the real world of EMI testing, a couple dB variation in the ultimate noise floor isn't a big deal unless it is pushing the noise floor up close to the limit. That shouldn't be the case, except when a combination of a possibly damaged receiver and unrealistic limit (Hello, Gert) combine to give you fits. The question of what BW is the "correct" one to use in this application is tailor-made for Werner Schaefer. He lives, eats and breathes this stuff. Werner, where are you? Ken Javor Phone: (256) 650-5261 > From: Brian O'Connell <[email protected]> > Date: - 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
