I am facing a similar issue: I have a 24VDC powered device that needs to meet CISPR 11. We planned to recommend a particular class B power supply with this device. However the noise from our device appears to be pushing through the power supply and limiting the combo to class A. The problem area is in the 5-30 MHz. range.
So now I need to resolve if the power supply by itself is the issue or if our device is the culprit. Radiated wise I can achieve class B with this combo. Chris Wells Eaton Corp Subject: Re: CISPR 11 Question In message <[email protected]>, dated Fri, 15 Jun 2012, "Birdsall, Gail" <[email protected]> writes: >My question is whether conducted RF emissions on non mains ports is >required or not for equipment connected to a 24V power distribution >network by either EN61326-1 or CISPR 11 standards. We can nowhere find >that it is a requirement. Consider the Essential Requirements of the Directive, not what a particular standard wasn't written to cover. If your non-mains ports emit significantly, you should measure those emissions, and justify in your EMC assessment what limits you apply. It isn't clear why the type of power supply should affect whether non-mains port emissions are measured. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Instead of saying that the government is doing too little, too late or too much, too early, say they've got is exactly right, thus throwing them into total confusion. 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.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]>
