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arXiv · 2605.16833

Design and Verification of a New Current Source for Tsinghua Tabletop Kibble Balance

Yuhan Ma·Kang Ma·Wei Zhao·Lisha Peng·Songling Huang·Shisong Li
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Abstract

This paper presents an ultra-stable current source tailored for the one-mode, two-phase (OMTP) measurement scheme in Tsinghua tabletop Kibble balances. To achieve simultaneous high resolution and nA/A-level stability, a composite 'coarse-fine' control topology is proposed, utilizing a dual-DAC architecture and an active digital feedback loop. Experimental results show that the Allan deviation reaches 1 nA/A at an integration time of approximately 3 minutes, representing a tenfold improvement in measurement speed compared to commercial-source-based setups. Furthermore, the design offers a significant cost advantage, providing a satisfying option for high-precision, cost-effective mass realization.

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Yuhan Ma, Kang Ma, Wei Zhao, Lisha Peng, Songling Huang, Shisong Li. 2026-05-16. Design and Verification of a New Current Source for Tsinghua Tabletop Kibble Balance. https://arxiv.org/abs/2605.16833

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