I did not check the latest version of this draft, but if this is really written down it means that:
1 second in any 15 second period during 120 seconds. that means 8 x 1 second peak over the limit would pass. That is a duty cycle of 12.5 % I know a lot of equipment that will pass this way, especially if no limit is given. Basically this could imply that a set of 8 of these *not failing* equipment could theoretically create a 100% of the time unlimited spectrum disturbance. I do not think that this could be the intention. Regards, Ing. Gert Gremmen [email protected] www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. Van: [email protected] [mailto:[email protected]] Namens John Woodgate Verzonden: Wednesday, February 11, 2009 7:46 PM Aan: [email protected] Onderwerp: Re: Brief and Isolated In message <4c5e6457cd7911469a07260381288c282157e...@orsmsx502.amr.corp.intel.com>, dated Wed, 11 Feb 2009, "Pettit, Ghery" <[email protected]> writes: >1. The emission does not exceed the limit for more than 1 second, >and > One second??? That's an age these days. Especially if it's 120 dB above the limit. >2. The emission does not exceed the limit more than once in any >15 second observation period.? That's probably reasonable. But I think that specific numbers are always going to be controversial. I'd prefer guidance in a Note, covering duration, average occurrence rate AND level. Maybe the sum of 20*log(duration in seconds) and level above the limit in dB could be specified. Zero looks attractive for a guidance figure. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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]>
