Certain immunity tests in the IEC 61000-4-x series require that the barometric pressure be within a certain range. Typically not an issue, unless your lab is in some place like Denver, Colorado (or higher). Then you might be pushing the low end of the allowable pressure range. And, regardless, you need to record the conditions present at the time of the test.
Ghery Pettit Intel Corporation _____ From: [email protected] [mailto:[email protected]] On Behalf Of Ralph McDiarmid Sent: Monday, March 31, 2008 1:38 PM To: [email protected] Subject: RE: Looking for Barometric pressure meter Why is a calibrated barometric pressure reading important for an EMC lab? Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc. From: [email protected] [mailto:[email protected]] On Behalf Of Pettit, Ghery Sent: Saturday, March 29, 2008 4:58 PM To: [email protected]; Garnier, David S (GE Healthcare); [email protected] Subject: RE: Looking for Barometric pressure meter 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, <mailto:[email protected]> David S (GE Healthcare) To: [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 - ---------------------------------------------------------------- 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
