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
Download:
IMEKO-WC-2000-TC3-P093.pdf
DOI:
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Event details
Event name:
XVI IMEKO World Congress
Title:

Measurement - Supports Science - Improves Technology - Protects Environment ... and Provides Employment - Now and in the Future

Place:
Vienna, AUSTRIA
Time:
25 September 2000 - 28 September 2000
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