They really should be asking for X successive readings spaced no more than Y minutes apart showing no further change in temperature. (it might show steady state or a small oscillation between readings) I've always used a precision (not accuracy) of 0.5 deg C for determining a trend. _____________________________________________________________________________________
Ralph McDiarmid | Schneider Electric | Renewable Energies Business | CANADA | Regulatory Compliance Engineering From: John Woodgate <[email protected]> To: [email protected] Date: 01/11/2012 07:45 AM Subject: Re: [PSES] Steady State Conditions In message <e9c52f9e77c43c49a56a22691b3680be22e...@tk5ex14mbxc301.redmond.corp.micro soft.com>, dated Wed, 11 Jan 2012, Ted Eckert <[email protected]> writes: >Unfortunately, UL talks in terms of percentages for temperatures. I >always hate when UL does this, but I believe that their intention is to >indicate percentage in terms of the temperature in degrees Celsius. Not only that, "(no more than a 1- percent net increase between the last two readings)" implies you have to measure to 1 part in 1000 to have confidence in your 1%. So I'll assume they mean degrees Rankine, because then 1 part in 1000 is a realistic 0.5 degree. (;-) -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Some people who are peeling the finch of the financial crisis are thinking of biting a rook. - ---------------------------------------------------------------- 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://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]> ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ - ---------------------------------------------------------------- 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://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]>
