Chris, I've built several CDN's. Repaired both CDN's and LISN's. Never messed with building an EM clamp. Too much hassle IMO. As far as calibration, I try to calibrate as much as is practical "in house". All the LISN's, ISN's, CDN's, cable loss, amplifier performance, etc etc . But in reality those "calibrations" are just "verifications". To perform those verifications most people are lacking a network impedance analyzer. The test jigs or setups are easy to build or cheap to purchase. Regarding an accrediting organization accepting the results, you'll need a process. You can't go wrong by referencing CISPR 16 et. al. in that respect. You'll need the verification data. AND, you'll need the measurement uncertainty. The last item, you can gather from your impedance analyzer accuracy specifications (and calibration report) and the test jig VSWR & losses. As for where you can send you in-house built test items, most any ISO17025 test lab which calibrates EMC or similar devices can perform the calibration. Regards David Spencer EMC Engineer Xerox Corp.
________________________________ From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of cmander...@micron.com Sent: Wednesday, December 10, 2008 5:00 PM To: emc-p...@ieee.org Subject: DIY Equipment and Calibration I'm aware of some people making their own CDN's and LISN's among other things and I have few questions about that. 1) Has anyone tried to build their own EM Injection clamp? If so, were you able to find a ferrite supplier that sold half-ring cores? 2) Is it acceptable to calibrate your own equipment? If so, how do accrediting bodies view this, and what documentation will they want to see? If not, does anyone have suggestions about where in the US I can send such homemade equipment for calibration (preferably Western US to save on shipping)? Thanks, Chris - ---------------------------------------------------------------- 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://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 <emcp...@ptcnh.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://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 <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>