PERFORMANCE OF THE NEW PROTOTYPE BALANCE OF THE NRLM

S. Mizushima, M. Ueki, Y. Nezu, A. Ooiwa

Abstract

The purpose of this paper is to show the performance of the new mass comparator (AT1007), which can take the place of the traditional mechanical prototype balance (NRLM-2) used at the NRLM. Using the AT1007 mass comparator, mass comparisons were carried out in vacuum with a standard deviation of 0.1 mg. Gas densities of air, nitrogen gas, and wet nitrogen gas were measured using the BIPM equation and a set of buoyancy artifacts in order to examine their consistency for buoyancy correction. Using the buoyancy artifacts, the mass difference between the kg prototype and a stainless steel standard was determined in two ways, from the weighing data in air and in vacuum. After correcting for surface effect, the results agreed to within the expanded uncertainty of 0.0076 mg.

Keywords

mass comparator, vacuum, kg prototype

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IMEKO-WC-2000-TC3-P093.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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