In message <[email protected]>, dated Tue, 17 Jul 2007, Robert Johnson <[email protected]> writes:
>Not sure where you got the idea it was limited to telecom devices. This >was intended for all the equipment currently covered by IEC 60950 and >60065. >Requirements include labeling and instructional warnings which refer to >the need for caution while listening to music for long periods. >Additional quotes: > > The objective of this clause is to provide protection against >hearing impairment > from excessive sound levels produced by electronic equipment. > > The following shall be subjected to the requirement of Clause 11.4.2 >08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066 >003100360035003800300032003500310035000000 : What is that string for? > - Equipment provided with an acoustic energy source output for >wired connection > to an acoustic output transceiver intended to be worn in, around, or >over the ears > (for example, earphones, headphones, ear implants, or earbuds) and; > - Wireless acoustic output transceivers intended to be worn in, >around, or over > the ears (for example, earphones, headphones, ear implants, or >earbuds). Yes, well, it's due to the confusion I explained. There will be attempts at recovering the situation. I'm pretty sure that the figures quoted are about acoustic shock in its correct definition (i.e. transient very high level sounds, 'clicks'). There is a side-comment about audio sources, but no figures: There are also voltage limits for audio sources. Zealots are now using 'acoustic shock' to include long-term exposure, which is an abuse. Once zealots are involved, semantic accuracy goes out of the window, and not by accident. -- 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 ______________________________________________________________________
