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Self-heating Effect of Standard Platinum Resistance Thermometerin Media and Measurement Method
REN Jianping, LI Ting, DIAO Fuguang, SUN Jianping
Acta Metrologica Sinica ›› 2025, Vol. 46 ›› Issue (5) : 667-672.
PDF(942 KB)
PDF(942 KB)
Self-heating Effect of Standard Platinum Resistance Thermometerin Media and Measurement Method
Aiming at the problem of difficulty in accurately measuring the standard platinum resistance thermometers in environments such as constant temperature baths, a method based on comparison and repeated measurement for the self-heating effect of the standard platinum resistance thermometers suitable for fluctuating media is proposed, and the influence of different media on the self-heating effect of the thermometer are compared. The results indicate that methods based on comparison and repeated measurements of more than 50 times can effectively reduce the impact of temperature fluctuations on the measurement of self-heating effect. The self-heating effect of the standard platinum resistance thermometers in commonly used media generally reaches 1.0 mK or above, which significantly affects the accuracy of the standard platinum resistance thermometers in value transfer. Therefore, it is necessary to accurately measure and correct the self-heating effect of the standard platinum resistance thermometers in value transfer.
temperature measurement / standard platinum resistance thermometer / self-heating effect / thermostatic bath / value transfer
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