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The Mass and Force (MF) Group in the Quantum Measurement Division (QMD) of the Physical Measurement Laboratory (PML) at the National Institute of Standards and Technology (NIST):
Quantifying the environmental contributions to mass change—Since the inception of the SI system of units, physical mass artifacts have been transferred and exchanged in order to disseminate the kilogram. The kilogram is essential to a broad range of …
SI-traceable Dynamic Force—Established calibration methods for force transducers are static, with a known constant force applied to the transducer and compared to the transducer indication. However many force measurements …
Small Mass and Small Force Metrology at NIST—There are two projects: The electronic milligram; and NIST-on-a-chip optomechanical methods for calibration of mass, force, laser power and other quantities.
Calibration of Force Transducers—NIST provides calibration services for force-measuring devices by applying known forces, either tension or compression, to the elastic device and recording the sensed deformation. Most calibrated …
National Type Evaluation Program (NTEP)—The NTEP program is administered through the National Conference on Weights and Measures (NCWM).
NIST Mise en Pratique of the New Kilogram Definition—As part of a New SI system of units to be adopted in 2018, the kilogram will be redefined so that it may be realized in terms of Planck’s constant. By experimental necessity, this new realization …
Calibration of Mass Standards—NIST maintains the national standard for mass in the form of the prototype kilograms (K4, K20, K79, K92, and K102) and provides services to support the parts of the national measurement system that …
Reconditioning of the 4.45 MN deadweight machine—Physical disassembly of the 4.45 MN (1,000,000 lbf) deadweight machine (DWM) began in FY15 in order to address material galling that developed in key structural components within the stainless …
Physical Measurement Laboratory (PML)