Many amplifier manufacturers will specify that their harmonic content is -15 dBc, or similar, at a certain power output. If you exceed that power output, which is well below how the manufacturer rates the amp, the harmonic content degrades rapidly. Ken Javor
Phone: (256) 650-5261 > From: John Woodgate <[email protected]> > Date: Thu, 2 Feb 2012 16:24:47 +0000 > To: <[email protected]> > Subject: Re: IEC 61000-4-3 Field Uniformity Measurement > > In message > <64D32EE8B9CBDD44963ACB076A5F6ABB01C55612@Mailbox-Tech.lecotech.local>, > dated Thu, 2 Feb 2012, "Kunde, Brian" <[email protected]> writes: > >> A 1db change in the amp's input will result in a 1db change in the >> amp's output (or fairly close to it) if operating within its linear >> range. > > This isn't a very sensitive measure of overload in terms of harmonic > generation. If you do a Fourier analysis of, for example, a sine wave > with 0.5 dB peak clipping, you will see that the harmonic content is > already significant. I did have this documented somewhere, but I can't > find it at present. > -- > OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > Some people who are peeling the finch of the financial crisis are thinking of > biting a rook. > > - > ---------------------------------------------------------------- > 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.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > 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 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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]>
