Hmmmm, This conductive layer of snow reminds me of a daydream/ thought experiment that I had for measuring emissions...
What if you put a DUT inside a chamber that looked like a hemisphere. The chamber would be hollow (otherwise, how would the DUT get in). The chamber "skin" would be a sandwich with a thin layer of absorber on the inside and a good conductor (conductor 1) then a dielectric then another good conductor (conductor 2) on the outside. Why these layers? The inner layer would offer just enough attenuation to reduce reflections, while letting some energy get to the conductor 1 behind it. The conductor 1 layer would effectively be a "integrating measurement antenna" which picks up and integrates all emissions from the DUT. The dielectric layer would insulate conductor 1 from conductor 2. (maybe this layer would need to be RF absorbant as well, not sure). The conductor 2 layer would be grounded all the way around and would serve to block ambients. What would happen? Would conductor 1 capacitively couple to the DUT such that a simple swept RF voltage measurement between the DUT and conductor 1 would show the total interference produced by the DUT? Who's with me? Let's go to K-mart and get: A large dome tent. About 50 square yards of tin foil Some Tokin flexible ferrite stuff ** A DUT. An RF voltmeter/spectrum analyzer and a stub cable. ** **probably not available at K-mart...maybe Wal-Mart? Might make a fun experiment, or maybe give the neighbors the idea that you're building an escape pod to the mother ship. Any immediate pitfalls that can be foreseen by the collective gurus? Chris Maxwell | Design Engineer - Optical Division email [email protected] | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
