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对于标准铂电阻温度计的使用,我们比较关心它的精度。本文用一种新的评定方法,对O～-182.962℃标准铂电阻温度计的精度予以研究。据国际实用温标(IPFS-1968),在O～-182.962℃范围内,标准铂电阻温度计的电阻与温度的关系式为: W(t)=W_(CCT68)(t)+△W(t)(1) △W(t)=A_4t+c_4_t~3(t-100)(2)式中,W_(CCT68)(t)为参考函数,△W(t)为偏差函数,常数A_4、C_4由铂电阻温度计在水沸点与氧沸点及冰点的电阻测定值确定。由于W_(CCT-68)(t)为已知,所以该温度计在此温区内的准确度,取决于该支温度计A_4、C_4的准确程度。从标准铂电阻温度计试行检定规程-JJG160-75给出:
For the use of standard platinum resistance thermometer, we are more concerned about its accuracy. In this paper, with a new evaluation method, the accuracy of O ~ -182.962 ℃ standard platinum resistance thermometer is studied. According to the international practical temperature scale (IPFS-1968), the relationship between the resistance and the temperature of the standard platinum resistance thermometer is: W (t) = W CCT68 (t) + ΔW (t) (1) △ W (t) = A_4t + c_4_t ~ 3 (t-100) where W_ (CCT68) (t) is the reference function and ΔW (t) is the deviation function. The constants A_4 and C_4 are given by Platinum resistance thermometer boiling point in the water and oxygen boiling point and freezing point determination of the measured value. Because W_ (CCT-68) (t) is known, the accuracy of the thermometer in this temperature range depends on the accuracy of the thermometers A_4 and C_4. From the standard platinum resistance thermometer trial verification procedures -JJG160-75 gives: