分銅の体積と質量の比較校正装置

概要

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In order to improve the reliability of weight calibration, a fully automatic mass comparator has been installed in an airtight chamber. In the chamber, the density of the inner air is controlled within ±0.0001 kg/m^3 in the density range from 0.7 to 1.2kg/m^3,and mass comparison can be done with the fixed environmental conditions. Utilizing this setting, the mass and the volume of a test weight are simultaneously measured. Moreover, a decrease of the uncertainty of the air buoyancy correction and the standard deviation of the mass comparison will be expected. An ainight chamber was made of stainless steel, divided into upper and lower cases, and has a cylindrical shape with an inner diameter of about 700 mm and height of about 740 mm. A mass comparator having a capacity of 1002 g and a readability of 0.001 mg was used for carrying out automatic mass comparison between four weights. This paper describes the features and results of performance evaluations of the comparator.
社団法人精密工学会の論文
2001-04-05