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<sup>-4</sup>. In addition, it was proved that the largest component of uncertainty was u(I), which was 2.8×10<sup>-4</sup>. Therefore the high-precision constant-current source was recommended to reduce uncertainty of magnetic field of joule balance.
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