The 1 cm squared microchip used for NIST’s Johnson Noise Thermometry work, fabricated at the Boulder, Colo., campus.
NIST has recently made substantial improvements to its Johnson-noise thermometry system, which is playing a vital role in the worldwide effort to determine the value of a key physical constant in time for the impending redefinition of the International System of Units (SI) in 2018. The system is now capable of yielding statistical uncertainties 10 times smaller than its
JILA physicists have measured Albert Einstein’s theory of general relativity, or more specifically, the effect called time dilation, at the smallest scale ever, showing that two tiny atomic clocks, separated by just a millimeter or […]
In 2025, to commemorate 150 years since the signing of the Metre Convention, EURAMET has published the 4th edition of ‘Metrology in Short’. The new version of Metrology in Short (MiS), like its predecessors, is designed for […]
The MSL Uncertainty Calculator is an Excel spreadsheet that provides an uncertainty table suitable for summarising and propagating uncertainties. The total uncertainty is calculated together with the effective degrees of freedom and coverage factor. This […]
