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arXiv · 2605.19203

Design and Initial Test of the Weighing Unit for Tsinghua Tabletop Kibble Balance

Weibo Liu·Nanjia Li·Lushuai Qian·Wei Zhao·Lisha Peng·Songling Huang·Shisong Li
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Abstract

This paper presents a customized weighing unit developed for the Tsinghua tabletop Kibble balance. The system is based on a flexure hinge mechanism sourced from a commercial weighing cell, with a major modification to the feedback control loop. The redesigned loop incorporates a capacitive displacement sensor for high-resolution position detection and a novel PID control strategy that ensures both fast dynamic response and high static stability. Initial characterization results demonstrate a repeatability better than 0.1 mg in air for 1 kg mass exchanges, validating the system's potential for high-accuracy mass metrology in Kibble balances.

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Weibo Liu, Nanjia Li, Lushuai Qian, Wei Zhao, Lisha Peng, Songling Huang, Shisong Li. 2026-05-19. Design and Initial Test of the Weighing Unit for Tsinghua Tabletop Kibble Balance. https://arxiv.org/abs/2605.19203

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