There is a guideline in EN 60335-2-6, the part 2 for stationary cooking ranges, ovens, hobs and similar appliances. Note 101 under 11.7 indicates:
"Steady conditions are considered to be established if the temperature does not rise by more than 1 K in 15 min." I don't know if it's intended to be generally applicable, or if the same guidance is in other 60335 part 2 standards, but it seems as good a guide as any. Scott Aldous Compliance Engineer AE Solar Energy From: [email protected] [mailto:[email protected]] On Behalf Of Ted Eckert Sent: Wednesday, January 11, 2012 7:45 AM To: [email protected] Subject: RE: Steady State Conditions Long ago, when I worked with heating and cooling equipment, Underwriters Laboratories defined temperature stability as follows. "A temperature was considered to be constant when three successive readings taken at 10-min intervals indicated that stabilized temperatures were established (no more than a 1- percent net increase between the last two readings). If the temperatures measured were within 5 percent of the [temperature limits defined within the standard] the test was continued until two successive 10-min readings indicated constant temperatures." There was further clarification that if a temperature reading was cycling between two different points, the maximum temperature of each cycle was to be used. If the cycle time was less than 10 minutes, the peaks of cycles greater than 10 minutes apart were to be used for comparison. For cycles lasting longer than 10 minutes, the peaks of three consecutive cycles were to be used. 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. Ted Eckert Compliance Engineer Microsoft Corporation [email protected]<mailto:[email protected]> The opinions expressed are my own and do not necessarily reflect those of my employer. From: Steli Loznen [mailto:[email protected]] Sent: Wednesday, January 11, 2012 4:33 AM To: [email protected] Subject: Re: Steady State Conditions Hi Jacob, In some testing procedures, the temperature steady state is defined as the status when the variation of the temperature, measured with thermocouple, was less than 1 K/s. Maybe this can help. Best Regards, Steli Steli Loznen, M.Sc., SM-IEEE I.T.L (Product Testing) Ltd. Q.A & Certification Manager Convener IEC/TC62/SC62A/MT29 Member of IEEE-PSES BoD 1, Bat Sheva St., P.O.Box 87 LOD 71100, ISRAEL Phone:+972-8-9186100 int.203 Fax:+972-8-9153101 Mobile:+972-54-7245794 e-mail: [email protected]<mailto:[email protected]> www.itl.co.il<http://www.itl.co.il> From: Jacob Gleeson [mailto:[email protected]]<mailto:[mailto:[email protected]]> Sent: Wednesday, January 11, 2012 12:32 PM To: [email protected]<mailto:[email protected]> Subject: Re: [PSES] Steady State Conditions Unfortunately not. From: John Woodgate <[email protected]<mailto:[email protected]>> To: <[email protected]<mailto:[email protected]>> Date: 11/01/2012 09:51 Subject: Re: [PSES] Steady State Conditions ________________________________ In message <of830d029f.67d294e3-on80257982.0032cbc6-80257982.00341...@meluk.co.uk<mailto:of830d029f.67d294e3-on80257982.0032cbc6-80257982.00341...@meluk.co.uk>>, dated Wed, 11 Jan 2012, [email protected]<mailto:[email protected]> writes: >Does anyone know of a clear definition of steady state conditions when >conducting heating tests? I have checked a number of 60335 series part >2 standards and came up blank for a definition:-( It's probably in Part 1. -- 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. 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