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

TL;DR
This paper introduces a specially designed weighing unit for the Tsinghua tabletop Kibble balance, featuring a high-resolution sensor and a novel control strategy, achieving high accuracy and stability for mass measurement.
Contribution
The paper presents a new weighing unit with a capacitive sensor and a modified PID control loop, enhancing performance for high-precision mass metrology in Kibble balances.
Findings
Repeatability better than 0.1 mg in air for 1 kg mass exchanges
System demonstrates high static stability and fast dynamic response
Validates potential for high-accuracy mass measurements
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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