Abstract

The design and calibration of high current with high-stability has been a problem in metrology, a current calibration system with high-stability is introduced, which includes a novel DC current comparator, an original sampling method for high-precision current source, an adaptive control method for air enclosure. The stabilities of major components are analyzed and measured individually. The measurement results show that when the current is 300 A, the stability in one hour can be up to 5.7×10−7, and the uncertainty of measurement is 1.8×10−6.

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