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TitleIn situ measurement of resistance thermometer self-heating and response time
Publication TypeJournal Article
Year of Publication1994
AuthorsSutton, C.M.
JournalMeasurement Science and Technology
Pagination896 - 899
Date Published1994
ISSN09570233 (ISSN)
KeywordsCalibration, Electric currents, Heating, Installation, Loop current step response, Measurement errors, Resistance thermometer, Self heating measurement, Sensing current, Temperature measurement, Thermal noise, Thermometers
AbstractA new method for measuring the self-heating and response time of resistance thermometers is presented that can be applied to thermometers installed in situations where the temperature may be fluctuating and/or drifting with time. A technique developed for mass comparisons is used to analyse a sequence of ten indicated temperature measurements recorded with sensing currents I1 and I2 in the sequence (I1I2)5. Self-heating values are obtained with sub-millikelvin accuracy using standard equipment from self-heating changes of less than 1 °C. The response time of the installed resistance thermometer is obtained by repeating this sequence of measurements as a function of the delay between changing the sensing current and measuring the indicated temperature.

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