Abstract
Based on the result of the Extraordinary Calibrations conducted by the Bureau of Weights and Measures (BIPM) using the international prototype of the kilogram (IPK) from the end of 2013 to 2014, it was found that the BIPM ‘as-maintained mass unit’ was offset by 35 µg from the mass of the IPK. This result is used by BIPM to create a model. A model has been used to estimate the correction of all 1 kg mass calibration certificates ever issued by BIPM in the period 1992 to 2014. The value of highest mass standard owned by Research Center for Metrology LIPI (RCM LIPI) also updated. This updated mass value affected the calibration results of RCM LIPI working standard by 34 µg. The statistical process control and control chart of check standard weights are used to monitor the impact of the updated mass on mass dissemination for RCM LIPI calibration customer.
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