| Abstrakt: |
Abstract:The kilogram will be redefined in 2018 and National Metrology Institutes are working to identify and reduce uncertainties related to its realization and dissemination. At the National Institute of Standards and Technology (NIST), a unique system for disseminating the vacuum-based kilogram realization to air is under development. A magnetic suspension mass comparator (MSMC) is utilized to directly compare a mass in vacuum to a mass in air with sources of uncertainty stemming from the measurement environment, the suspension apparatus, and the measurement facility itself. To accurately characterize this process, gravitational gradients were measured, ambient vibrations of the lab characterized, and the ambient environmental stability examined. |
