Another interesting observation...
Perhaps the lack of data showing correlation between
a) atmospheric pressure at the test lab
and
b) widespread ESD upset in the field
is an indicator that the test method and test levels (including lack of
altitude restrictions) are sufficient to protect the consumer/user/public?
- the lack of any widespread ESD failure phenomena, even with world-wide
permeation of electronics into everyday life, indicates that the standards
groups are doing a great service for the public, although somewhat anonymously.
Best Regards,
Patrick.
[email protected]
From: [email protected] [mailto:[email protected]] On Behalf Of Cortland
Richmond
Sent: Tuesday, April 01, 2008 3:10 PM
To: Pettit,Ghery; Derek Walton
Cc: [email protected]; Garnier,David S (GE Healthcare); emc-pstc
Subject: RE: Looking for Barometric pressure meter
I see the CCL OATS is in Wanship, UT, at about 6854 feet, and their HQ is in
ZIP Code 84119, which Wunderland.com says is at 4380 feet.
Cheyenne, Wyoming is at 6025 feet. Any test labs there? I suppose one might
pressurize it...
Cortland
KA5S/6
>From: "Pettit, Ghery" <[email protected]>
>Sent: Apr 1, 2008 8:34 AM
>To: Derek Walton <[email protected]>
>Cc: [email protected], "Garnier, David S (GE Healthcare)"
><[email protected]>, [email protected]
>Subject: RE: Looking for Barometric pressure meter
>
>In quickly checking the 61000-4-x series that are called out in CISPR
>24, IEC 61000-4-2 (ESD) is the only one. Section 8.1.1 calls out the
>acceptable climatic conditions for performing the tests, and the
>atmospheric pressure must be between 86 kPa and 106 kPa. That's a
>range of 25.4 inches of Hg to 31.3 inches of Hg. As standard
>atmosphere at sea level is 29.92 inches of Hg at 59 degrees F, and
>pressure drops about 1 inch per 1000 feet of altitude gain, you can see
>that you hit the minimum pressure on a standard day at 4520 feet.
>Denver is at 5280 feet (one of the steps on city hall). Not sure how you can
"legally"
>perform ESD testing in EMC labs in most of Colorado. :-)
-
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