I read in !emc-pstc that Cortland Richmond <[email protected]> wrote (in <[email protected]>) about 'Standardizing Ferrites' on Sat, 20 Dec 2003: >Ed Price wished: > >>> I sure wish that ferrite manufacturers had a color-code system like you >have >for resistors. Sure, some of those beads & chips are darn small, but I >wonder if even high-volume parts might be markable with some kind of >laser-etched bar-code. (Reading that bar code might be another challenge!) >OTOH, even if, starting tomorrow, all ferrites were marked, it would >probably take longer than my lifetime for the supply of unmarked stashes to >be exhausted. << > >If they but knew... when one's employer wisely refuses to tie compliance to >a single-sourced part, that part is ruled off-limits then and forever -- or >until the EMI engineers find a second source in a new product data sheet. >Standardized beads -- R, X and *size* -- would save a lot of engineering >time and hassle. I've often had to write a part number request noting in >LARGE letters that A is a sub for B -- AND NOT THE REVERSE. > >Aargh.
So, take the matter up in IEC TC51. See IEC 61332 and 61333. But even if you succeed internationally, persuading US manufacturers to adopt the IEC standard may be difficult. A lever might be that you will only call up ferrites that conform to the standard, i.e. Japanese, Chinese and Taiwanese products. (;-) -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
