I don't know what your definition of a 'true ground' is but the facts are simple. If you share a discharge path with a signal path the discharge will overwhelm the signal and the device will fail, sometimes catastrophically. You have obviously created a signal ground. Now create a discharge ground (i.e. chassis ground). Tie it to your connector shells but keep it as far away from the signal ground as possible.
Fred Townsend [email protected] wrote: >The problem that I have is that my power supply is a class II product. i.e. I do not have a true ground and also as we all know the printer is in a plastic box. > >thanks >Pete > > > > 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/listserv/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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
