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| Design of LCR Meter Based on Self-balancing Bridge |
| HU Bei-bei, WU Kang, JIN Hai-bin, YAN Xiao-jun, WANG Shu-qiang |
| Beijing Orient Institute of Measurement and Test, Beijing 100086, China |
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Abstract Commercial standard LCR meter used for traceability relies on import,and domestic commercial instruments cannot meet the requirements of impedance traceability. To solve the problem, A LCR meter with basic accuracy of ±0.02% was designed. The design principle and various methods for implementation were discussed. An impedance meter based on self-balancing bridge method was designed. The hardware of the LCR meter includes FPGA core board, half-bridge circuit board, embedded touch PC and power supply. The upper computer program was developed on VS2005 platform to exchange data with hardware through RS-232 interface and serial port communication protocol. Through experimental verification, the performance of the developed impedance measurement instrument is stable and reliable, which can meet the needs of high accuracy impedance traceability.
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Received: 28 July 2019
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2019, Vol. 40 
