John
Obviously loudspeakers could be affected by external magnetic fields - and
thus should be tested using the procedure described in EN 61000-4-8
(immunity to power frequency magnetic fields). Thus CE marking against the
EMC Directive is appropriate. In addition, in some instances the drive
voltages are sufficiently high to bring the devices within the scope of the
Low Voltage Directive - and again CE marking may be appropriate.
However, I have attached a link below to one section of Statutory Instrument
2372 which enforces the EMC Directive within the UK. This clearly states:
"Electromagnetically benign apparatus
17. These Regulations do not apply to apparatus the inherent
qualities of which are such that neither is it liable to cause, nor is its
performance liable to be degraded by, electromagnetic disturbance"Thus whilst I agree with your view on loudspeakers, I don't concur with your view of the wider issue. Does anybody else have any ideas? Thanks Ian Gordon -----Original Message----- From: John Woodgate [mailto:[email protected]] Sent: 17 September 2002 22:15 To: [email protected] Subject: Re: CE Marking for Passive speakers I read in !emc-pstc that Gert Gremmen <[email protected]> wrote (in <[email protected]>) about 'CE Marking for Passive speakers' on Tue, 17 Sep 2002: >Officially this type of "apparatus" does not qualify >for ce marking due to the reasons you gave. That is simply not correct. EN 60065 specifies the safety requirements. The EMC Guidelines document explains that having no active components is NOT grounds for exemption from the EMC Directive. While most loudspeakers do not emit anything except constant magnetic field, some have crossover inductors with open ferrite cores. These emit audio-frequency magnetic fields which are quite strong enough to disturb a CRT display significantly. That there are no limits for this is due to CISPR/E (now CISPR/I) having more important matters to work on. -- 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.ewh.ieee.org/soc/emcs/pstc/ 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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" _____________________________________________________________________ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com _____________________________________________________________________ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com
Electromagnetically benign apparatus.zlt
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