I've used a 5-sided cube inside the chamber to create a draft-free environment for performing flammability tests. The open side faces the front so you can see the equipment. The test flame is quite still. I would believe this would also work for temperature measurements.
Rich > -----Original Message----- > From: Peter Tarver > [mailto:[email protected]] > Sent: Wednesday, March 02, 2016 1:21 PM > To: [email protected] > Subject: Re: [PSES] Ambient temperature > > Alternatively, assuming the typical wire rack shelving in the > chamber and > a relatively small EUT, free air flow can be limited by > placing three wire > rack shelves onto adjacent levels that are out of the main air > circulation > pattern in the chamber and placing pieces of cardboard or > corrugated > fiberboard onto the two outer shelves, with the EUT on the > center of the > middle shelf. Place a thermocouple 25mm to 50 mm above > the EUT to provide > an ambient temperature measurement. > > Never rely on the environmental chamber's controls or > internal > thermocouples for internal ambient air temperature > measurement. They will > rarely give the temperature at the location the EUT is placed. > > If the EUT is large the environmental chamber needs to be > much larger than > the EUT, as indicated by others. > > > Peter Tarver > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
