Surprised John W. did not mention magnetic fields from EN 55103-1 & 2 although the standard is for Professional Audio. Emissions- Phenomena 2. Enclosure port (for rack mount); magnetic fields, 50 Hz to 50 kHz measured at 10 cm. Using basic Standard EN 55103-1 : 1996, Annex A. The Emission limits to be met are 50 Hz - 500 Hz 4 - 0.4 A/m at 10 cm (The limit decreases linearly with the logarithm of the frequency), and 500 Hz - 50 kHz 0.4 A/m at 10 cm. Phenomena 3. Enclosure port (for non-rack mount); magnetic fields, 50 Hz to 50 kHz measured at 1 m. Using basic Standard EN 55103-1 : 1996, Annex A. The Emission limits to be met are 50 Hz - 5 kHz 1 - 0.01 A/m at 1 m (The limit decreases linearly with the logarithm of the frequency), and 5 kHz - 50 kHz 0.4 A/m at 1 m. Immunity- Phenomena 3. enclosure port; magnetic fields, 50 Hz to 10 kHz. Using basic Standard EN 55103-2 : 1996 see annex A. The Immunity requirements to be met are 3 - 0.03 A/m, 20 Hz to 5 kHz, 0.03 A/m, 5 kHz to 10 kHz (homogeneous/pseudo homogeneous magnetic field decreasing linearly with the logarithm of frequency from 50 Hz to 5 kHz and constant from 5 kHz to 10 kHz). Criterion to be applied A (the apparatus shall continue to operate as intended).
Chuck McDowell Meyer Sound Laboratories Inc. Regards, Chuck McDowell Meyer Sound Laboratories Inc. From: John Woodgate [mailto:[email protected]] Sent: Friday, March 05, 2004 12:08 PM To: [email protected] Subject: Re: Pace makers, speakers, magnetic fields I read in !emc-pstc that Sosnoski, Michael <[email protected]> wrote (in <[email protected] om>) about 'Pace makers, speakers, magnetic fields' on Fri, 5 Mar 2004: >I know speakers are part of the audio/video world, but IEC 60065 does >not go much into safe limits of sound pressure, and magnetic fields. Can >anyone point me into some standards, text, or general safety >considerations with respect to loudspeakers? IEC 60065 covers all the aspects of safety of loudspeakers per se that can be quantified. Safe limits of sound pressure depend very much indeed on the environment and are covered by OSHA rules, or the equivalent in other countries. The magnetic fields of loudspeakers are of no significance in the context of safety, barring bizarre contrived situations. -- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk 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 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
