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Magnetic Uncertainties for Compact Kibble Balances: An Investigation



Shisong Li, Stephan Schlamminger


The Kibble balance has become one of the major instruments for realizing the mass unit, the kilogram, in the revised international system of units (SI). Researchers at about a dozen national metrology institutes are actively working with Kibble balances that are capable of weighing masses with nominal values from 100 g to 1 kg. In the future, the design of smaller Kibble balances will play a more significant role. Smaller Kibble balances require smaller magnet systems, and here we investigate the scaling of systematic uncertainties with the size of the magnet system. We describe the size dependence of three magnetic effects: the coil-inductance effect, the yoke nonlinear effect, and the thermal effect. The analysis shows that the relative systematic effects become increasingly larger with smaller sizes. For small magnets the thermal effects become dominant and, hence, a good thermal design is imperative.
IEEE Transactions on Instrumentation and Measurement


Kibble balance, magnetic circuit, magnet design, mass metrology


Li, S. and Schlamminger, S. (2022), Magnetic Uncertainties for Compact Kibble Balances: An Investigation, IEEE Transactions on Instrumentation and Measurement, [online], 10.1109/TIM.2022.3189726, (Accessed April 14, 2024)
Created July 18, 2022, Updated November 29, 2022