Subject: Re: Question about electrical shielding From: Ralph Muehleisen <muehleisen@xxxxxxxx> Date: Fri, 14 Dec 2007 17:43:54 -0600 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Compared to acoustic isolation, electrical isolation can be quite a bit easier. You may be able to add simply shielding to a standard booth at a much lower cost than trying to buy a shielded booth. Building a high quality wireless shielded room was much easier and cheaper for our wireless research group here at IIT than the fairly crude anechoic chamber one of our acoustic researchers built. If you are certain you want to buy a booth made for both, might want to look into the companies that design and build "tempest" rooms for secure DOD and DOE facilities. You might be able to find a company that will certify both. An old, but perhaps still useful web page for tempest rooms is at http://www.eskimo.com/~joelm/tempestsource.html Ralph On Dec 14, 2007 1:58 PM, Katrin Krumbholz <katrin@xxxxxxxx> wrote: > Dear All, > > we may be looking to buy a new sound-booth soon, which we want to use for > EEG and which should thus have "electrical shielding". I have asked IAC and > they said they build electrically shielded booths, but I am not sure whether > they would be the best. Thus I wonder whether anybody could give me any > advice on the following two questions: > > (i) Which company would you recommend us to approach? > (ii) What do you think are the requirements in terms of shielding for EEG? A > norm published by the German Association for Electrical, Electronic & > Information Technologies (VDE) says that noise levels should not be higher > than Bpp (peak-to-peak amplitude of magnetic field) < 2e-7 T. However, some > people seem to think that that limit is too lenient. > > Any advice would be gratefully received. Many thanks in advance, and Happy > Xmas!!! Katrin > > Dr Katrin Krumbholz > MRC Institute of Hearing Research > University Park > NG7 2RD Nottingham > > Phone: +44 (0)115 922 3431 > Fax: +44 (0)115 951 8503 > > > > This message has been checked for viruses but the contents of an attachment > may still contain software viruses, which could damage your computer system: > you are advised to perform your own checks. Email communications with the > University of Nottingham may be monitored as permitted by UK legislation. > -- Ralph T. Muehleisen Assistant Professor, Civil, Architectural and Environmental Engineering Illinois Institute of Technology, Chicago, IL 60616 tel: 312-567-3545 fax: 312-567-3519 email: muehleisen@xxxxxxxx url:http://acoustics.iit.edu/muehleisen