If a zygote weighs around a milligram, 80dB is just about right.

Orin Laney
 
On Sun, 1 Nov 2009 07:35:52 -0600 Robert Heller <rehel...@mmm.com>
writes:
> 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
> dio 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>
> 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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