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. :-)
Ghery From: Derek Walton [mailto:[email protected]] Sent: Monday, March 31, 2008 5:14 PM To: Pettit, Ghery Cc: [email protected]; Garnier, David S (GE Healthcare); [email protected] Subject: Re: Looking for Barometric pressure meter Hi Ghery, I'm curious as to which EMI test requires pressure, and has limits set for it? Cheers, Derek Walton L F Research Pettit, Ghery wrote: > > The information provided by the FAA and weather guessers is pressure > corrected to sea level. It is not the actual pressure. I can get an > altimeter setting in Denver (mile high) or Olympia (206 ft MSL) and it > will be in the same range, even though the actual pressure in Denver > is about 5 inches of mercury lower. This is one of my favorite > questions when auditing a lab when they have a barometer on the wall - > is that absolute pressure, or corrected to sea level? And I usually > get blank looks. And you want to report absolute pressure. > > Ghery Pettit > > PP-ASEL > > > > *From:* [email protected] [mailto:[email protected]] *On Behalf Of > *Cortland Richmond > *Sent:* Saturday, March 29, 2008 2:44 PM > *To:* Garnier, David S (GE Healthcare); [email protected] > *Subject:* RE: Looking for Barometric pressure meter > > Why not get the air pressure from the nearest FAA control tower by > radio? Critesfield Airport in Waukesha broadcasts airfield information > that includes updated barometric pressure > > http://www.critesfield.com/facilities/ > > Cortland > > KAS/6 > > ----- Original Message ----- > > *From:* Garnier, David S (GE Healthcare) > <mailto:[email protected]> > > *To: *[email protected] <mailto:[email protected]> > > *Sent:* 3/28/2008 10:25:25 AM > > *Subject:* Looking for Barometric pressure meter > > Hello, > > I am looking for advice or suggestions for the purchase of a > Barometric pressure meter for our EMC lab... > > - ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. Website: http://www.ieee-pses.org/ > > To post a message to the list, send your e-mail to [email protected] > > Instructions: http://listserv.ieee.org/request/user-guide.html > > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > > Scott Douglas [email protected] Mike Cantwell [email protected] > > For policy questions, send mail to: > > Jim Bacher: [email protected] David Heald: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc - > ---------------------------------------------------------------- This > message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. Website: http://www.ieee-pses.org/ > > To post a message to the list, send your e-mail to [email protected] > > Instructions: http://listserv.ieee.org/request/user-guide.html > > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > > Scott Douglas [email protected] Mike Cantwell [email protected] > > For policy questions, send mail to: > > Jim Bacher: [email protected] David Heald: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
