You are technically correct in all regards. NB & BB are relative to the receiver IFBW. A long time ago, IFBWs were not specified. Today, most standards do specify IFBW, so that it isn¹t entirely arbitrary. The main reason for a single detector is that a long time ago a sweep using an average detector would have taken forever. Nowadays, detectors are simulated and the same fast sweep can give results for both average and quasi-peak and peak detection. So in that regard, the instruction to use a single detector is antiquated, but you have to go by the obsolete spec.
Ken Javor Phone: (256) 650-5261 From: spud <s...@garlic.com> Reply-To: <s...@garlic.com> Date: Thu, 30 Jun 2022 15:21:00 -0700 To: <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Vehicle EMC limits Good afternoon. I'm trying to understand some vehicle EMC standards better. I'm sure this is an easy one for the list's experts. UN/ECE Regulation 10 (R10) and ISO 13766 have different limits for ³narrowband² and ³broadband² emissions, but the detector bandwidth requirements are the same for both emission types. Several standards (and search engine hits) indicate that the termss ³narrowband² and ³broadband² refer to an emission's bandwidth relative to a receiver's IF bandwidth, not to a signal's fundamental frequency. In light of the above, the intent does not seem to be to measure narrowband and broadband emissions separately, but to observe the measured spectrum and evaluate the results against both of the limits. The peaky (spikey) results against the narrowband limits and the more spread out results against the broadband limits. Do I understand this correctly? If not, or there is more to the story, please educate me. Regards and thanks, Peter Tarver - ---------------------------------------------------------------- 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.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 - ---------------------------------------------------------------- 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.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
