Here's the whole story, from soup to nuts. Prior to 1993, MIL-STD-462 contained no guidelines on sweep times or dwell times and step rates. MIL-STD-462 was released in 1967 when all susceptibility testing was done manually. The "time constant" of the "human-in-the-loop" was considerably longer than the response time of the typical test sample, and no control needed to be exercised to keep the test from sweeping too fast.
But by 1993, when MIL-STD-462D was released, sweeping synthesized generators driving wide-band amplifiers were the norm, with or without computer control, and control did have to be exerted to avoid sweeping at a rate faster than the test sample could evidence susceptibility. Thus we have Table III. In 1993, they used a one second dwell time, and very small step sizes. In the deliberations running up to the -E revision, there was quite a bit of discussion that we ought to lengthen the dwell time and increase the step sizes in a manner that yielded no change to the overall length of swept frequency susceptibility tests. The dwell time lengthening was of course to ensure time for the test sample to respond, and the increased step size was based on a general agreement that the -462D step sizes were too conservative. A comparison of the two tables between -462D and -461E reveals that below 1 GHz, we did in fact increase step sizes, but unfortunately they were not changed above 1 GHz, and with the increase to a three second dwell time, the -461E RS103 test became onerous indeed. That was fixed in the -F revision process, again polling the working group members as to whether they were seeing any microwave susceptibilities so sharply tuned that the step sizes could not be relaxed. No one had any such experience, and thus we have the -461F Table III. Ken Javor Phone: (256) 650-5261 > From: "Airy, Chad" <chad.a...@ga-asi.com> > Reply-To: "Airy, Chad" <chad.a...@ga-asi.com> > Date: Sun, 10 Nov 2013 16:49:47 -0800 > To: <EMC-PSTC@LISTSERV.IEEE.ORG> > Conversation: Table III Susceptibility Scanning; MIL STD 461 E vs F > Subject: [PSES] Table III Susceptibility Scanning; MIL STD 461 E vs F > > Historical Question, > > Will someone please give a little of the rationale for the changes in rev E vs > F of Table III, Susceptibility Scanning. > > Thanks > > Chad > Ofc: 858.762.6853 | Cel: 858.527.8149 > > - > ---------------------------------------------------------------- > 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.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > 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://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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>
