In message <[email protected]>, dated Tue, 5 Jan 2010, Fred Townsend <[email protected]> writes:
>If the discharge is interrupting the signal then the signal low and the >shield ground are being combined at some point. USB is a differential >signal. Sounds like something is connected wrong at either the mouse >end or the USB receiver chip end. Whatever voltage is on the shield is ALSO on the differential pair, as a common-mode signal. The CMRR may well not be enough to cope, and the permissible common-mode voltage may be exceeded anyway. -- 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 I should be disillusioned, but it's not worth the effort. - 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://www.ieeecommunities.org/emc-pstc 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]>
