I know of switching power supply running in the 10's of kilohertz that radiates significantly in the range of 5-8 Gigahertz. Fortunately, due to average fundamental frequency control, when you multiply that variation by the number of harmonics to get out to the gigahertz range the emissions are really broadband, so the average and QP are quite low.
- Bill Just in case something important comes up... http://www.usa.gov/Contact/Elected.shtml or... https://writerep.house.gov/writerep/welcome.shtml http://www.senate.gov/general/contact_information/senators_cfm.cfm --- On Fri, 8/28/09, Andrew McCallum <[email protected]> wrote: From: Andrew McCallum <[email protected]> Subject: EMC Testing of Power supplies To: "[email protected]" <[email protected]> Date: Friday, August 28, 2009, 6:14 AM Hi Many manufacturers of switch mode power suppliers now only seem to be carrying out testing of conducted emissions to 100MHz Claiming that previous work has shown that there are no significant radiated emissions from these power suppliers. I understand their logic but for railway safety cases radiated emissions up to 1GHz should be measured. Not sure if I should stand firm and say test to the standard or accept the logic of the argument. Any thoughts? Regards Andy ________________________________ Confidentiality: This e-mail and its attachments are intended for the addressees only (or people authorised to receive them on their behalf) and may be confidential or privileged. If they have come to you in error you must take no action based on them, nor must you copy or show them to anyone; please delete them from your system and reply to this e mail highlighting the error. Security: Please note that this e-mail has been created in the knowledge that internet e-mail is not 100% secure. Anyone who communicates with us by e-mail is taken to accept this. Viruses: We have taken steps to ensure that this e-mail and attachments are virus free, but we advise that in keeping with good computing practice you should ensure that they are actually virus free. ________________________________ DeltaRail Group Limited registered office Hudson House, 2 Hudson Way , Pride Park , Derby , DE24 8HS . Registered in England and Wales , number 5839985. Please refer to www.deltarail.com - ---------------------------------------------------------------- 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 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]>
