The automotive guys are having a bit of a chuckle. Their immunity levels are somewhat higher due to field surveys of what field strengths the cars might be driven through. At one point a few years ago one car manufacturer was asking for 600 V/m. I think they settled on 200 V/m. Do car drivers complain more about their cars than the house stereo??
- 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 --- On Fri, 10/30/09, Gary Wong <gw...@trapezenetworks.com> wrote: From: Gary Wong <gw...@trapezenetworks.com> Subject: RE: Where does 3V/m & 10V/m in RI come from? To: "Radojicic, Marko" <mradoji...@opnext.com>, "Ken Javor" <ken.ja...@emccompliance.com>, EMC-PSTC@LISTSERV.IEEE.ORG Date: Friday, October 30, 2009, 5:24 PM Marko: I remembered the RI levels were based on field strength survey of the populated areas close to the radio transmitter towers. There are lots of field survey papers about the RI limits presented to and reviewed by the committees for ballot. One famous case was the kitchen fan playing radio music because the house close to the AM transmitter tower was exposed to 10V/m field strength. Cheers, Gary Wong Technical Leader H/W Engineering gw...@trapezenetworks.com <http://us.mc396.mail.yahoo.com/mc/compose?to=gw...@trapezenetworks.com> Direct: 925.474.2244 Phone: 925.474.2200 Fax: 925.251.0642 ---------- Privileged/Confidential Information of Belden may be contained in this message. If you are not the addressee of this message, you may not read, copy or use this message, or deliver this message to anyone. In such event, you should destroy the message and kindly notify the sender by reply e-mail. It is understood that opinions or conclusions that do not relate to official business of Belden are neither given nor endorsed by Belden. ________________________________ From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Radojicic, Marko Sent: Friday, October 30, 2009 12:59 PM To: Ken Javor; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: Where does 3V/m & 10V/m in RI come from? Hi Ken, From your response, you probably don’t know Alvin very well if at all. You can say a lot of things about Alvin (and I probably have :-) ) but embarrassing the profession isn’t one of them. But backing off from the personal issues, your response didn’t really address the question of where the limits come from. Having participated in standards making committees, I would have to say that there is as much political posturing as engineering going on. I seriously doubt that there is any scientific investigation that points to 1, 3, 10 V/m providing adequate protection for certain environments. I always assumed that the standards committee picked these numbers because they looked good on a logarithmic chart. It would be informative if someone on the forum was actually a member of the original CISPR committee and could refute my [perhaps] jaded experience. …Marko - ---------------------------------------------------------------- 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 <http://us.mc396.mail.yahoo.com/mc/compose?to=emc-p...@ieee.org> > 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. 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