To answer your specific questioin, no I do not believe it was properly applied. In the one case I was involved with, it was an ultrasonic sensor that could be connected to anything, including (and most likely) a large system that is AC powered. My point is that I don't think annex B should be applied anyway, since it is an "informative" annex, and there is a product family standard that applies to this product that does NOT have a provision for raising the lower frequency limit. Think of it this way, Annex C is also an informative annex, which deals with the proper selection of the test level. If testing to a product family standard that specifies a test level of 10v, can you use the "informative" annex of 61000-4-6 to justify lowering the test level to 1v? I think the product family standard rules in this case. Bob Richards, NCT.
Oliver Betz <[email protected]> wrote: Bob Richards wrote: > Twice recently I've seen where annex B of 61000-4-6 ed2.2 is > referenced by someone and used as a reason for not requiring testing > down to 150 kHz "since the cable is specified as being less than x > meters in length". (Of course, this is after the EUT failed at a low > frequency!) Was Annex B applied correctly? Only very special setups are subject to higher starting frequencies, e.g. the keyboard attached to a battery powered PC, never used with AC adaptor. Most devices are galvanically coupled to sources of low frequency disturbances, in this case the starting frequency must not be raised. I read this from Annex B and it makes sense. Oliver -- Oliver Betz, Muenchen - 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 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 ______________________________________________________________________
