A Bi-polar Current Source with High Short-term Stability for Tsinghua Tabletop Kibble Balance
arXiv:2408.16405
Abstract
A high-precision current source, capable of supporting weighing measurements with a relative uncertainty at the 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 paper, we introduce a digital-feedback, two-stage current source 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 the proposal can offer an easy realization of a current source with nA/A stability to support Kibble balance measurements.
10 figures, submitted to IEEE Trans. Instrum. Meas