Jon R. Pratt, Stephan Schlamminger, David B. Newell, Leon S. Chao, Zeina J. Kubarych, Patrick J. Abbott, Yusi A. Cao, Frank C. Seifert, Darine El Haddad
NIST recently used a watt balance instrument known as NIST-3 to measure the Planck constant in terms of IPK with a relative uncertainty of approximately 45 parts in 10e9. Along the way to this new NIST value of h, the instrument was also employed to perform the reciprocal experiment: h was fixed and the unknown mass of a stainless steel mass standard was calibrated with reference only to standards of length, time (frequency), and electrical quantities, all derivable from fixed fundamental constants. This paper reviews the basic principles of a watt balance experiment and shares the results of a trial dissemination of mass directly from an instrument, rather than from an artifact.
ASPE Annual Meeting Proceedings
November 9-15, 2014
29th Annual Meeting of the American Society of Precision Engineering
, Schlamminger, S.
, Newell, D.
, Chao, L.
, Kubarych, Z.
, Abbott, P.
, Cao, Y.
, Seifert, F.
and El, D.
A constant from a mass, a mass from a constant, ASPE Annual Meeting Proceedings, Boston, MA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917043
(Accessed August 12, 2022)