Abstract
A thin-film platinum resistance thermometer (SDT101A, Tama Electric Work Company, Japan), which is available commercially, has useful characteristics for thermometry in the range of 20 to 300 K and in high magnetic fields up to 5 T. The Z function-table of this platinum resistance thermometer (PRT) was obtained experimentally. It was confirmed that SDT101A PRT would be useful in the temperature range of 20 to 300 K within a precision of ± 0.1 K. This confirmation was achieved by using a two-point calibration method with the Zfunction. The magnetoresistance of this PRT at 30 K is ≈ 1.5% for a magnetic field of 5 T, whose value is one order of magnitude smaller than that of a standard type PRT.
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