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A New Spin on Kibble: A Self Calibrating Torque Realization Device at NIST



Zane Comden, Stephan Schlamminger, Charles Waduwarage Perera, Frank Seifert, David B. Newell, Jay H. Hendricks, Barbara L. Goldstein, Leon Chao


After the 2019 redefinition of the International System of Units (SI), torque no longer needs to be traceable to a calibrated weight suspended from a known lever arm. Specifically, a modification of the Kibble principle used for realizing the kilogram allows for direct realization of torque via electrical measurements traceable to the revised SI. A recent NIST/US Air Force collaborative effort to design, construct and characterize a self-calibrating electromechanical instrument mainly consisting of a tabletop-sized permanent magnet-electromagnet system aimed at generating 1 mN m to 1 N m with 0.1% accuracy for directly calibrating torque tools is underway. This instrument, the Electronic NIST Torque Realizer, is intended to replace the current torque standards of mass and length, and put primary torque realization standards in the hands of calibration facilities.
Proceedings Title
euspen's 22nd International Conference & Exhibition
Conference Dates
May 30-June 3, 2022
Conference Location
Geneva, CH


metrology, torque, Kibble


Comden, Z. , Schlamminger, S. , Waduwarage Perera, C. , Seifert, F. , Newell, D. , Hendricks, J. , Goldstein, B. and Chao, L. (2022), A New Spin on Kibble: A Self Calibrating Torque Realization Device at NIST, euspen's 22nd International Conference & Exhibition, Geneva, CH, [online], (Accessed June 12, 2024)


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Created June 3, 2022, Updated November 29, 2022