In message <[email protected]>, dated Wed, 27 Jun 2007, "Kunde, Brian" <[email protected]> writes:
>I wish the standard had the margin built in somehow, but that doesn't >seem practical for everyone. They do have margin built-in, but you won't get many to admit it, because it sounds bad, politically. Also, manufacturers can only take advantage of it if they can use the 80-80 rule (which allows a small percentage of non-compliant product to be shipped). Interference that matters results in complaints to authorities. If no-one complains, it can't matter, can it? So it makes economic and practical sense to set the limits so that there is a small but manageable level of complaint. Few will admit that this is what is done, but, whether intentional or not, it IS what happens in many cases. If there are never any complaints, the limit is set too low, maybe a lot too low, isn't it? So the 'margin' is between the actual limit (resulting in, say, 10 complaints a year) and that higher limit (resulting in, say, 50 complaints a year) that would cause the authorities to demand its reduction. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk There are benefits from being irrational - just ask the square root of 2. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
