I had never heard of a TEM cell before but I found this article which is a good introduction: http://www.emcs.org/acstrial/newsletters/summer08/pp2.pdf Sean On Fri, Oct 15, 2010 at 2:33 PM, Gary Crowell wr= ote: > I think what is being talked about here is normally referred to as an 'RF > shield box'. =A0There are lots of them around for testing cell phones, > bluetooth devices and such. =A0We found one used last year for a few hund= red > dollars - try dovebid or ebay. =A0We also built a larger one for laptops = and > small systems out of 80/20, with galvanized sheet steel for sides and lin= ed > with RF absorbent foam. > > OTOH the OP may be talking about an 'RF screen room (or box)' =A0aka 'Far= aday > Cage'. =A0Depends on what they are trying to do/measure. =A0We've also bu= ilt one > of those out of 80/20 and copper mesh. =A0There are several screen rooms = on > ebay > > TEM and GTEM cells are yet another animal. > > Gary > > On Thu, Oct 14, 2010 at 11:10 PM, Xiaofan Chen wrote= : > >> On Fri, Oct 15, 2010 at 6:46 AM, Richard Prosser >> wrote: >> >> > I haven't made one but we have some small ones here at work that don't >> > look too difficult to copy. >> > >> > I'd start with an old microwave oven and add absorbent material. The >> > hardest part may be finding something suitable. The boxes we have here >> > are lined with a carbon loaded foam (at least that's what it looks >> > like) =A0but we still get reflections from it. You have to be careful = to >> > position the DUT in exactly the same location each time & not rely on >> > the results too much! (Final tests are done in a proper chamber). >> > >> > If you can afford it, I think it's a case of bigger is better, and the >> > more absorbent material you can squeeze in the better also. >> >> >> Interesting. I thought all these chambers were worth >> half a million to several million US dollars. But I >> was only thinking of standard 3m and 10m chamber >> for EMC/EMI testing. Our 3m chamber is under >> construction so that I can avoid to go for evening >> testing in outside test lab. >> >> -- >> Xiaofan >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > > > -- > ---------------------------------------------- > Gary A. Crowell Sr., P.E., CID+ > Linkedin > Elance > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .