IIRC the radiated immunity limits are set at X dB of something above the emissions limits creating a guard band. The theory being that there is a built in tolerance between the allowable emissions in the field and the level at which equipment is supposed to begin to be susceptible.
I think I heard this explanation off-line from one of the “old men of EMC” at one of our conferences/symposiums years ago. We were most likely consuming alcohol at the time. This might just be urban legend. Alvin Disclaimer: The contents reflect the opinion of the author and are meant for entertainment purposes only. ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Kunde, Brian Sent: Thursday, October 29, 2009 10:18 AM To: [email protected] Subject: Where does 3V/m & 10V/m in RI come from? Simple question, where does the 1V/m, 3V/m and 10V/m test levels come from in the Radiated Immunity standards such as IEC/EN61000-4-3? Is there some real-world rf source that correlates to these levels? Thanks for the history lesson. The Other Brian _________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - 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]> - 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]>
