Title :
Development and evaluation of the tin point in the ITS-90
Author :
Sato, K. ; Tamba, J. ; Kishimoto, I. ; Arai, M.
Author_Institution :
Nat. Inst. of Adv. Ind. Sci. & Technol., Nat. Metrol. Inst. of Japan, Ibaraki, Japan
Abstract :
The freezing point of tin, one of the temperature fixed-points defined in the ITS-90, is newly developed and evaluated. The temperature stability of the furnace is within ±1.5 mK for 24 hours and temperature distribution is within 2 mK over 20 cm. To realize a stable plateau after a large amount of supercooling, the air blow cooling method is introduced instead of the conventional method. The temperature during the plateaus decreases only 0.3 mK for 8 hours and a good repeatability within ±0.026 mK is obtained in ten measurements.
Keywords :
furnaces; temperature control; temperature measurement; ITS-90; air blow cooling; calibration; furnace; repeatability; supercooling; temperature fixed point; temperature stability; tin point; Aluminum; Electrical resistance measurement; Furnaces; Metrology; Platinum; Stability; Temperature control; Temperature distribution; Thermal resistance; Tin;
Conference_Titel :
SICE 2002. Proceedings of the 41st SICE Annual Conference
Print_ISBN :
0-7803-7631-5
DOI :
10.1109/SICE.2002.1195319
