Derek - If you have some images to share I can put them in a public folder if you email them direct to me:
http://drive.freevirtualservers.com/9055383-355894223 From: [email protected] [mailto:[email protected]] On Behalf Of Derek Walton Sent: 13 May 2009 16:04 To: John Woodgate Cc: [email protected] Subject: Re: Dimmer Switch I think you are missing th point John, I'm not saying harmonics aren't there: I've stressed harmonic rich as much as I can..... It's all down to what you see on the display of the SA, and thats sweep time dependent. Ken describes that well. The lines that appear on the display are spaced on sweep time not frequency. It would be useful to show graphs on the group! Cheers, Derek. John Woodgate wrote: > In message <c630442d.4265c%[email protected]>, dated Wed, 13 > May 2009, Ken Javor <[email protected]> writes: > >> Have to admit to being confused by the Woodgate-Walton discussion. >> The way I see it, the dimmer switch is indeed generating a harmonic >> rich signal. The spectrum analyzer, due to the required EMC >> bandwidths, doesn't show each individual harmonic - the bandwidth is >> wider than the harmonic spacing. Therefore the dimmer switch is >> creating what appears to be broadband noise, as long as your >> reference point is audio frequency bandwidths necessary for radio >> communications, and by extension EMI measurements. > > I agree. The harmonics are there, whatever you can or can't see on the > SA display. - 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]> This message (including any attachments) may contain confidential information intended for a specific individual and purpose. If you are not the intended recipient, delete this message. If you are not the intended recipient, disclosing, copying, distributing, or taking any action based on this message is strictly prohibited. - 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]>
