Here's an interesting comparison of EMI emissions from a 2-layer PCB versus a very similar 4-layer PCB. The poster does a really good job of explaining the reasons for the differences, and his demo technique is simple and clean.
https://www.youtube.com/watch?v=crs_QLuUTyQ&feature=em-uploademail The video also gives you a peek into an Australian lab's test chamber. The poster visited that same lab about 7 years ago and made a more inclusive tour video of the facility. https://www.youtube.com/watch?v=ZM3jWYGNoLU He also has a video on the bare 4-layer board, where he talks about the effects of power plane capacitance. https://www.youtube.com/watch?v=CBD9vwKcvtY And lastly, he has another video demoing positioning of various types of capacitors bypass elements. https://www.youtube.com/watch?v=1xicZF9glH0 Ed Price WB6WSN Chula Vista, CA USA - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
