If you just need the flow over the unit then get a good length of tube (air conditioning duct, round / square or rect in section) large enough to take your unit with space around it, a variable speed desk fan and a hot wire or mechanical (vaned) anemometer* (air velocity measuring instrument).
Place unit in middle of tube, the fan at one end and if a hot wire anemometer then place thru a drilled hole in the duct positioned well down stream of unit, if a vaned type then probably just have to place at end of duct (but a little way in). The duct will need to be fairly long (wrt the UUT) to reduce turbulence effects. Knowing the air velocity, and cross sectional area of the duct you can calculate the volume flow rate. If you stick thermocouples in the duct before and after the UUT you could get a rough calculation of dissipation too, (depending on the flow rates involved). *Anemometers: http://rswww.com 188-1125 Pitot tube,Digitron,AF200,anemometer 188-1119 Anemometer,kit,Digitron,AF200 or hire one or borrow one from your local friendly heating and ventilation/ process extract company. Chris -----Original Message----- From: Dan Mitchell [mailto:[email protected]] Sent: Tuesday, May 04, 1999 12:50 AM To: 'emc-pstc' Subject: LFM test rig My company produces AC to DC Power Supplies. I have been directed to make a quick and dirty test rig that will allow me to put a predetermined airflow in LFM over the unit. Does anyone know of a website that describes something like this or have had experience building such a test rig and would be willing to share their expertise. Daniel W. Mitchell Product Safety Associate Engineer EOS Corp. --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
