My experience while doing this kind of testing was that one has to not only for terminate the peripheral port in a proper load, but also terminate emissions from that port in a proper manner. Some printers, for example. would cheerfully pass emissions on the parallel port through to their power cords, happily radiating all the clocks a careless designer might have failed to consider important.
Cortland KA5S (/6) > [Original Message] > From: <[email protected]> > To: <[email protected]> > Date: 3/19/2008 8:56:42 AM > Subject: Terminations for PC during emission measurements > > Dear All, > ANSI C63.4 states that when testing a computer, its interface I/O are to be terminated by peripheral or load. > I am trying to find out the load impedance for parallel, serial, USB, etc- ports commonly found on a PC. My intention is to terminate the ports with load rather than actual peripheral to save cost. If someone has a 'quicker' and 'cheaper' way to do this, please enlighten me. > Thank you in advance. > Regards, Wendy Ny - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
