一种新型射频电压表校准仪的研究与设计

Research and Design of a New RF Voltmeter Calibrator

射频电压测量在科研和工业领域有着十分重要的应用,射频电压表校准仪在国家计量系统的各级计量站中被大量使用,承担了相当多的校准任务。介绍了一款新研制的智能仪器射频电压表校准仪,具有频带宽、动态范围高、准确度高、自动测试等优势,同时具有基本误差校准和频率附加误差校准功能,可以对各种类型的射频电压表进行自动或半自动校准并可自动生成校准证书。校准仪的设计分为两方面,分别是硬件和软件的设计与实现。硬件设计中针对基本误差的校准,设计了标准交流电压源,主要由交流电压发生器模块、电压放大模块,闭环反馈模块组成,得到高准确度的输出;针对频率附加误差的校准,设计了新型传感器的芯片和结构,可以更准确、简便地进行直流电压定标。软件设计主要包括测控模块、数据处理模块和显示模块,能够自动读取数值进行反馈调节、切换量程或频率、显示数值以及进行后续数据处理。介绍的射频电压表校准仪的设计处于国内领先水平,为国内校准仪的创新作出贡献,减少对国外仪器仪表的依赖,满足国内射频电压表检定、校准需求。

RF voltage measurement plays a crucial role in scientific research and industry.RF voltmeter calibrators are widely used in metrology stations at all levels of the national metrology system,undertaking numerous calibration tasks.This paper introduces a newly developed intelligent RF voltmeter calibrator that offers several advantages,including wide frequency bandwidth,high dynamic range,high accuracy,and automatic testing capabilities.It provides functions for basic error calibration and frequency additive error calibration,enabling automatic or semi-automatic calibration of various types of RF voltmeters and automatic generation of calibration certificates.The calibrator's design focuses on two aspects:hardware and software.In the hardware design,a standard AC voltage source is developed for basic error calibration.This circuit consists of an AC voltage generator module,a voltage amplification module,and a closed-loop feedback module,ensuring high-accuracy output.For frequency additive error calibration,a new sensor chip and structure are designed to facilitate more accurate and convenient DC voltage calibration.The software design encompasses the measurement and control module,data processing module,and display module.These modules enable automatic value reading for feedback adjustment,switching of ranges or frequencies,value display,and subsequent data processing.The introduced RF voltmeter calibrator design is at the forefront domestically,contributing to the innovation of domestic calibrators,reducing dependence on foreign instruments,and meeting the needs of domestic RF voltmeter verification and calibration.