In message <[email protected]>, dated Tue, 12 May 2009, Grace Lin <[email protected]> writes:
>Is there any specific instrument settings for taking power line >conducted emission? It seems the dimming function of a dimmer brings >up a lot of noise at low frequency such at 150 kHz. Disabling the >dimming function brings down the emission up to 30 dB at 150 kHz in one >case. If you mean the conventional 'turn-on' triac dimmer (or the 'reverse' type that turns off instead of on), the highest emissions are when the load current flows for a quarter of a cycle (conduction angle of 90 degrees). -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
