Abstract
In this study, the stability of four capsule-type standard platinum resistance thermometers (CSPRTs) has been checked by evaluating behavior of the calibrated values at each cryogenic fixed point of the International Temperature Scale of 1990 (ITS-90) below 273.16 K since around 2005. Performance of three capsule-type RhFe resistance thermometers (RIRTs) has been also observed at the triple points of Ne and $$e\hbox {-}\hbox {H}_{2}$$ . It is confirmed that CSPRTs and RIRTs are stable within the uncertainty of calibration at each low-temperature fixed point for a past decade except for one CSPRT. The resistance of the CSPRT was clearly affected by the accidental mechanical shock at TPW, although the variation of its calibration values was unclear at the triple points of Ar, $$\hbox {O}_{2}$$ and Ne and was still within the uncertainty at the triple points of Hg and $$e\hbox {-}\hbox {H}_{2}$$ . And the CSPRT shows stable behavior after re-calibration again.
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