Eric: Although this sounds like a good mechanical solution, there's a few electrical things that really worry me.
Is this magnetic sheet material electrically non-conductive? Maybe it is, with tiny little magnetic bits buried in a non-conductive plastic. OTOH, maybe you will get some reflections or refractions of an incident wave as it hits this material BEFORE hitting the ferrite tiles. Also, I measured a few magnetic decorations, and I found that the magnetic field strength at the rear surface is on the order of hundreds of Gauss. What effect might this strong magnetic field have on the uniform absorptive characteristics of the ferrite tiles? Maybe I'm raising unfounded concerns, but the proof would be in characterizing your chamber. I hope you proved the performance of the room AFTER you put up those magnetic sheets! Regards, Ed > -----Original Message----- > From: eric.lif...@ni.com [SMTP:eric.lif...@ni.com] > Sent: Monday, October 04, 1999 8:21 AM > To: emc-p...@majordomo.ieee.org > Subject: Re: Coatings for Ferrite Tiles? (Magnetic Wallpaper) > > Our new 3 meter ferrite chamber is lined with white sheet-magnet material, > the > same stuff used for refrigerator magnets and calendars.. All walls were > covered > by the installer, but you only really need it around the turntable end. > The > chamber seems to perform fine with it, but I'd recommend you rerun your -3 > field > uniformity for the obvious reasons. > > The best part is -- no glue! If you don't like where it stuck, just pull > it off > and try again. > > We kept the shipper/pick-list form and learned that ours came from > > Master Magnetics, Inc. > 108 Industry Road > Marietta, Ohio > 303-688-3966 > > The item number and description was ZG2024GW50MG MAG SHEET .020x24"x50' > GLOSS > WHITE. I don't know what the actual cost was, but in quantity it was > supposedly > less costly than wallpaper, if you can believe that. > > I suspect that if you searched the web for magnetic sheet you'd find a > supplier > nearby. > > Regards, > Eric Lifsey > Compliance Manager > National Instruments > > > :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 (Voice) 619-505-1502 (Fax) Military & Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-) --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
