Title :
Uncertainty analysis on the magnetic system of joule balance
Author :
Han, B. ; Li, C. ; He, Q. ; Li, Z. ; Li, X.
Author_Institution :
Nat. Inst. of Metrol., Beijing, China
Abstract :
Based on the special structure of exciting coils system of joule balance, the uncertainty sources of the magnetic density in the geometrical center of magnetic field was analyzed and evaluated. The relative combined standard uncertainty of magnetic field in ΔH/H was 4.9 × 10-4. In addition, it was proved that the largest component of uncertainty was u(I), which was 2.8×10-4. Therefore the high-precision constant-current source was recommended to reduce uncertainty of magnetic field of joule balance.
Keywords :
balances; coils; constant current sources; magnetic devices; magnetic fields; measurement uncertainty; exciting coils system; high precision constant current source; joule balance; magnetic density; magnetic field geometrical center; magnetic system; uncertainty analysis; Coils; Magnetic field measurement; Magnetic fields; Magnetic multilayers; Nonhomogeneous media; Standards; Uncertainty; Exciting coils; Plank´s constant measurement; joule balance; magnetic system; uncertainty;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2012 Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4673-0439-9
DOI :
10.1109/CPEM.2012.6250944
