That's the 80/20 rule, which is an entirely different thing. It applies
to standards committees; 20 % of members do all the work and 80 % just
accept the results.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-11-18 20:02, John Allen wrote:
Quick search on “80/80 rule history” yields (for a start!):
“It was named after it's founder, the Italian economist Vilfredo
Pareto, back in 1895. He noticed that people in society seemed to
divide naturally into what he called the “vital few,” or the top 20
percent in terms of money and influence, and the “trivial many,” or
the bottom 80 percent.”
And then
“The Pareto principle (also known as the 80/20 rule, the law of the
vital few, or the principle of factor sparsity) states that, for many
events, roughly 80% of the effects come from 20% of the causes. ...
Pareto developed both concepts in the context of the distribution of
income and wealth among the population.”
So the “rule” seems to date back to the late 19^th Century, although
(obviously!) not in the context of EMC control matters.
However, I’m guessing it was later adopted in that context as a
reasonable “rule of thumb” for assessing how well or not products
could be assessed as being compliant with EMC standards. I have
absolutely no idea when that might happened, but I would suggest
looking for/at documents that lead up to the earlier known emission
standards in the commercial field (military field was, and still is, a
rather different one).
John E Allen
W. London, UK.
*From:*John Woodgate [mailto:[email protected]]
*Sent:* 18 November 2019 19:47
*To:* [email protected]
*Subject:* Re: [PSES] 80/80 rule
I agree: I'm almost certain that it is German in origin, and I'm sure
it dates back to the 20th Century, possibly as early as 1960.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associateswww.woodjohn.uk <http://www.woodjohn.uk>
Rayleigh, Essex UK
On 2019-11-18 19:44, John Shinn wrote:
If my memory serves me right, as I recall, the 80/80 rule was in
at least one of the VDE standards regarding radiated emissions. I
can’t recall the number or name. This is going back to the late
‘70s or so.
John Shinn
Retired
Sent from my iPhone
On Nov 18, 2019, at 9:55 AM, John Woodgate <[email protected]>
<mailto:[email protected]> wrote:
Can someone tell me when the 80/80 rule was introduced into
CISPR standards and if possible, a bit more detail than just
the date, please?
--
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associateswww.woodjohn.uk <http://www.woodjohn.uk>
Rayleigh, Essex UK
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