John Woodgate wrote: There was a BIG argument between experts over the test signal to be used for assessing immunity to mobile phone emissions. CENELEC people prematurely chose the keyed-carrier signal, but it presents inconvenience in both generation and measurement. IEC experts (some from Europe) showed that sinusoidal modulation is quite acceptable and does not present those problems. See Annex A of IEC/EN61000-4-3:1995/7. -- I agree with John's comments. I have also done the comparison between on-off keying and sine wave modulation and found almost no difference on medical products. They measured to have the same susceptibility with either modulation. We conducted the test up to @.5 GHz. It was a joint effort between Motorola and HP/Agilent. I hope this helps.
Best regards, Jim -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of John Woodgate Sent: Monday, September 30, 2002 9:20 AM To: [email protected] Subject: Re: RADIATED IMMUNITY TESTING ABOVE 1GHz I read in !emc-pstc that Gordon,Ian <[email protected]> wrote (in <E1BA0362B28ED211A1E80008C71EA306018190CE@EXC_EAS01>) about 'RADIATED IMMUNITY TESTING ABOVE 1GHz' on Mon, 30 Sep 2002: >My mistake - the old light industrial generic immunity standard EN50082-1 >(and EN61000-6-1?) includes use of a "keyed carrier" at 900MHz No, IEC/EN 61000-6-1 doesn't include it either. There was a BIG argument between experts over the test signal to be used for assessing immunity to mobile phone emissions. CENELEC people prematurely chose the keyed-carrier signal, but it presents inconvenience in both generation and measurement. IEC experts (some from Europe) showed that sinusoidal modulation is quite acceptable and does not present those problems. See Annex A of IEC/EN61000-4-3:1995/7. -- 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 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"
