APPARATUS FOR REALIZING THE ITS-90 IN THE TEMPERATURE RANGE FROM THE TRIPLE POINT OF ARGON TO THE MELTING POINT OF GALLIUM

摘要

Systems for realizing the fixed points of the ITS-90 for calibrating column and capsule standard platinum thermometers, namely, the triple points of argon and mercury and the melting point of gallium, are constructed and investigated. The errors of the values of the metrological characteristics of the systems obtained enable one, using platinum resistance thermometers, to reproduce and transfer the temperature scale in the 83.8-302.9 K range. The extended uncertainty in reproducing the temperatures of the fixed points does not exceed 0.4 mK.