The Parametric--reference Function Interpolating Formula of Standard Platinum Resistance Thermometer (0~961.78°C)

摘要

In this paper we developed a new method for the determination of subrange of platinum resistance thermometer in the temperature interval from 0°C to 962°C and, on the basis of it, proposed the parametric-reference function interpoting formula, which coincides with the ITS--90 below 0.08 --1.3mK. The sub-range inconsistency of this formula is 0.3 --l.lmK, the maximum difference between the new formula and its inverse functions is 0.15 mK, the effects of 1mK errors at calibration-fixed points is below 1.03mK and the continuity is ensured-in the whole interval including the connection points. Our interpolating formula is of significance in applying ITS-90 in practice because of its accuracy, simplicity and convenience.