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
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