A Bi-Polar Current Source With High Short-Term Stability for Tsinghua Tabletop Kibble Balance

Abstract

A high-precision current source, capable of supporting weighing measurements with a relative uncertainty at the$10^{-9}$level, is essential for Kibble balance experiments. However, most current sources utilized in Kibble balances to date are homemade and not commercially available. In this article, we introduce a digital-feedback two-stage current source (DTCS) designed for the Tsinghua tabletop Kibble balance, relying solely on commercially available sources and voltmeters. A high-resolution, small-range current source is employed to digitally compensate for current output fluctuations from a large-range current source. Experimental tests show that the proposal can offer an easy realization of a current source with nA/A stability to support Kibble balance measurements.

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