Calibration of mass as Thailand's national standard

摘要

Calibration of mass as Thailand's national standard is presented. The test mass (m_(t)) and conventional mass(m_(ct)) are comparatively determined against the mass of reference weight (m_(r)) in air by using the double substitution weighing method (ABBA) which mathematical model have some difference from OIML, recommendation 111. Four weighting cycles are performed on each weight for class E_(2), which is range from 1 mg-20 kg according to OIML. The results of measurement and uncertainty calculation are also presented.