Agreed. A simple demonstration with MW or SW radio reception interference would be quickly grasped by the lay audience and would fit nicely into a 5 minute presentation. _______________________________________ _____________________________________________
Ralph McDiarmid | Schneider Electric | Renewable Energies Business | CANADA | Regulatory Compliance Engineering From: John Woodgate <[email protected]> To: [email protected] List-Post: [email protected] Date: 09/29/2011 10:14 AM Subject: Re: [PSES] EMC Demonstration ________________________________ In message <[email protected]>, dated Thu, 29 Sep 2011, Ken Wyatt <[email protected]> writes: >I've built up a number of demos for me EMC seminars, but maybe the >simplest and easiest to understand for non-EEs is to place a >breadboarded (battery-operated) 20 MHz crystal oscillator in a "leaky" >metal enclosure (could be a simple cookie tin) and tune an FM radio to >a station near 100 MHz. The oscillator should provide "full quieting" >(capture effect) to any stations that are heard. You can also probe the >harmonics with a spectrum analyzer and/or copper tape the seams to >demonstrate the fix. > >You could also get fancier and power it with a wall wart and measure >the harmonic currents on the cable While those are evocative demos for beginner technicians and freshmen, they will go far over the heads of a lay audience, i.e. lawyers, doctors and priests. (;-) You would have to explain 'quieting' (very difficult indeed!), 'harmonics' and 'spectrum'. You have to start with something that is not too far outside their experience. For that reason, AM radio is better than HF ('short wave') radio, because many will not have even heard of it before. -- 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 When I point to a star, please look at the star, not my finger. The star will be more interesting. - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ http://product-compliance.oc.ieee.org/> Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ <http://www.ieee-pses.org/> Instructions: http://listserv.ieee.org/request/user-guide.html <http://listserv.ieee.org/request/user-guide.html> List rules: http://www.ieee-pses.org/listrules.html <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 email has been scanned by the MessageLabs Email Security System. ______________________________________________________________________ - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ 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]>
