DOI: https://doi.org/10.30970/jps.04.216
STABILITY AND CALIBRATING METHODS OF SOME THIN FILM PLATINUM THERMOMETERS IN THE RANGE 13.8–273.16 K
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Journal of Physical Studies 4(2), 216–224 (2000)
DOI: https://doi.org/10.30970/jps.04.216
STABILITY AND CALIBRATING METHODS OF SOME THIN FILM PLATINUM THERMOMETERS IN THE RANGE
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J. K. Georgiev, D. A. Dimitrov, A. L. Zahariev
Bulgarian Academy of Sciences, Institute of Solid State Physics,
72 Tzarigradsko Chaussee, 1784 Sofia, Bulgaria
Resistance stability of thin film platinum resistance thermometers produced by PRIBOR Ltd., Koprivshtitza, Bulgaria was investigated 30 months after their thermal stabilization. A three-point calibration method for the range between 13.8 K and 273.16 K is proposed. The optimum conditions necessary for an adequate individual calibration of the investigated sensors are defined. Mathematical descriptions of the $T(R)$ and the $R(T)$ functions between 13.8 K and 273.16 K are suggested using a new weighted least squares method.
PACS numbers: 89.20.+d, 06.20.-f, 07.20.-n.