Brian:
I use an isolated feedthrough only as necessary, that is, only if it improves the noise floor and only across that frequency range where it might help. Typically, I use my isolated feedthrough only in the 20 Hz through about 5 kHz range. I have a type BNC isolated, female/female bulkhead coax fitting (I think the Pasternack number is PE9172, about $20) in my penetration panel just for this use. As I get up higher in frequency, I switch over to traditional grounded connectors. The small protrusion on each side of the penetration port does not affect my overall shielding effectiveness when I am not using the isolated feedthrough (but remember to disconnect both inner and outer coax cables when not actually using that port). You might also play with combinations of isolated AC analyzer power and grounding of your analyzer system to achieve lower noise floors. Ed Price ed.pr...@cubic.com <blocked::mailto:ed.pr...@cubic.com> WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty > -----Original Message----- > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Brian > Oconnell > Sent: Wednesday, July 13, 2011 3:52 PM > To: Emc-Pstc (E-mail) > Subject: bulkhead feedthrough for chamber > > Would appreciate construction tips for making an isolated bulkhead > feedthrough connection for my EMC chamber without making a mess of my noise > floor. > > thanks much, > Brian > > - > ---------------------------------------------------------------- > 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 <emc- > p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://product-compliance.oc.ieee.org/ > 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 <emcp...@radiusnorth.net> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher: <j.bac...@ieee.org> > David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://product-compliance.oc.ieee.org/ 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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>
