In message <off6f53536.11e4ba0e-on88257354.005174a1-88257354.0051c...@selinc.com>, dated Wed, 12 Sep 2007, [email protected] writes:
>However, the problem is that the lamps are used at distances much >closer than the standard measurement distance. I'm not sure that 'however' is an appropriate response to my message; I called attention to the importance of measurement distance. It may be that the common use at smaller distances was taken into account in setting the emission limits in CISPR 15/EN 55015. >Certainly they are a problem in the design lab when trying to make >sensitive measurements, That's a specialized application, and ipso facto, the people involved know about the problem and how to fix it. >and also a problem in the home where a radio and fluorescent light may >often be found close to each other. The same problem occurs with switch-mode power supplies, whether powering the radio or something else. Energy efficiency regulations are tipping the balance in favour of SMPS, ignoring this problem. The better solution is to use a non-switching supply with a larger than currently-used mains transformer, so that it has low no-load input current, but these make the power supply larger, heavier and more costly. -- 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 ______________________________________________________________________
