There have been inputs saying that GTEM results cannot possibly correlate with far field OATS measurements, but I disagree, based on personal experience with a customer who hired me to make that very thing happen for him.
My customer needed to qualify desktop devices, and they had bought quite a large GTEM cell, part of a turnkey system with spectrum analyzer, pre-amp and software. The only change I made to what they were doing was to tell them they needed to separately qualify the test sample-connected cables, because there was no way to properly expose those cables inside the GTEM cell. Even though it was large enough to step into and walk around a little, the GTEM cell wasn't large enough to stretch out cables. So on my instructions, they performed a cable common mode conducted emission test, with a limit based on the current one would see on a tuned dipole that would just meet the limit at three or ten meters, plus some margin. Once they had previously ascertained that the current limit was satisfied, they had no problem translating GTEM results into a passing grade on an OATS. Happy Dependence Day, everyone, and to our members in the UK, we are fast catching up with you and in no time at all we will all be wondering why we ever bothered with independence in the first place! Ken Javor Phone: (256) 650-5261 > From: <[email protected]> > Date: Fri, 3 Jul 2009 11:06:29 -0600 > To: <[email protected]> > Conversation: Correlating GTEM data with OATs > Subject: Correlating GTEM data with OATs > > I am trying to understand how to properly use TEM and GTEM cells to take > radiated emissions data. Has anyone had any success in correlating far > field radiated emissions measurements with GTEM measurements? > > Thanks, > Cody > > - > ---------------------------------------------------------------- > 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]> - 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]>
