Hey........I'm one of those "alcohol consuming old men of EMC". In fact, I
believe that I am a charter member of this group. I have also had close to
an 80 dB increase in mass over the years. And yes, I have been an
embarrassment to this (and many other professions) on occasion. : )
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
===================================================
From: Ken Javor <ken.ja...@emccompliance.com>
To: <EMC-PSTC@LISTSERV.IEEE.ORG>
Date: 10/30/2009 01:23 PM
Subject: Re: Where does 3V/m & 10V/m in RI come from?
Sent by: <emc-p...@ieee.org>
The only thing right about that post is the disclaimer, and that is only if
you have an odd sense of humor. RE limits are set to protect broadcast
radio reception, while RI/RS limits are set to bracket intentional
transmitters. The margin between receivers and transmitters is between
femto- and picowatt sensitivity and Watt or higher level transmission. If
you make the apples to rocks comparison of RE to RI/RS limits the “margins”
you come up with are on the order of 80 dB or higher. Is there another
engineering discipline that enforces that sort of margin? Can you envision
a bridge or building built with such margins? Would an airplane ever get
built, much less leave the ground? And that Ares rocket that just launched
successfully yesterday? What would lift-off look like with an 80 dB
increase in mass, huh?
Granted the previous post was in jest, but too many people take that sort
of thing at face value. This is embarrassing to the profession.
Ken Javor
Phone: (256) 650-5261
From: "Ilarina, Alvin" <alvin.ilar...@plantronics.com>
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Fri, 30 Oct 2009 10:30:53 -0700
To: "Kunde, Brian" <brian_ku...@lecotc.com>, <EMC-PSTC@LISTSERV.IEEE.ORG>
Conversation: Where does 3V/m & 10V/m in RI come from?
Subject: RE: Where does 3V/m & 10V/m in RI come from?
IIRC the radiated immunity limits are set at X dB of something above the
emissions limits creating a guard band. The theory being that there is a
built in tolerance between the allowable emissions in the field and the
level at which equipment is supposed to begin to be susceptible.
I think I heard this explanation off-line from one of the “old men of EMC”
at one of our conferences/symposiums years ago. We were most likely
consuming alcohol at the time. This might just be urban legend.
Alvin
Disclaimer: The contents reflect the opinion of the author and are meant
for entertainment purposes only.
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Kunde,
Brian
Sent: Thursday, October 29, 2009 10:18 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Where does 3V/m & 10V/m in RI come from?
Simple question, where does the 1V/m, 3V/m and 10V/m test levels come from
in the Radiated Immunity standards such as IEC/EN61000-4-3? Is there some
real-world rf source that correlates to these levels?
Thanks for the history lesson.
The Other Brian
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