I read in !emc-pstc that Ken Javor <ken.ja...@emccompliance.com> wrote (in <20011231204639.HFSF617.femail38.sdc1.sfba.home.com@[65.11.150.27]>) about 'EMC-related safety issues', on Mon, 31 Dec 2001:
>In a court of law one must swear to tell the truth, the whole truth, and >nothing but the truth. Indeed, but it is, of course, fatuous. One cannot tell if one even KNOWS the whole truth about anything, let alone whether one will be allowed by procedures and/or the wording of questions by counsel, to state the whole truth. >What you stated below is merely part of the truth. >The rest of the truth is that spurious emissions emitted by unintentional >radiators (the kinds of emissions controlled by CISPR 22 and Title 47, part >15B of the US Code of Federal Regulations) are at such low levels that there >is no ability to cause an adverse reaction to anything except a radio >receiver. It is only the field intensities associated with intentional rf >transmissions that are capable of stimulating electronics operating at >higher levels than radio receivers. Well, not 'no' ability, but the probability of significant interference is extremely low in the vast majority of cases. Of course, where safety- of-life is involved, we want the probability to be of the order of 10^-9, but this is not generally very difficult. Highly-sensitive systems should have very high immunity, and this includes receivers, in respect of out-of-band signals. It seems that civilian aircraft electronic systems do not have a very high level of immunity. We can begin to see why this subject is controversial. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
