电阻误差测量电路设计分析  

The design and analysis of resistance error measurement circuit

作　　者：刘乃清[1] 张焱[1] 

机构地区：[1]北京市电子科技情报研究所,北京100009

出　　处：《电子测量技术》2015年第12期20-25,共6页Electronic Measurement Technology

摘　　要：针对用户关心被测电阻相对于某一基准电阻的数值偏差这一需求,基于伏安法,设计了一款测量误差小、使用方便的电阻误差测量仪。该测量仪采用恒流源作为测试电源,测量值经运算放大器处理,通过模数转换器后以数字表示。本文通过剖析测试仪前端信号处理电路,说明了具体的设计思路、结构原理和元器件选型依据;重点论述了各局部电路对于测量结果造成的附加误差,定量估算了其数值的大小,并列举了就此采取的应对措施。最终根据对测试误差的分析计算,证明本测量仪具有满足使用要求的测量精度。Voltammetry is a common method for measuring resistance,the resistance error sorter is a widely used measuring instrument.In some specific applications,users have special interest on the deviation of the measured resistance relative to a reference resistor.The purposed design is based on such specific application requirements and to develop a resistance error measuring instrument.The measuring instrument uses a constant current power supply,the measured value is processed by the operational amplifier,the analog-to-digital converter,and presented in an intuitive digital form.The instrument haslow measurement error and easy-to-use features.By analyzing the front-end signal processing circuit of the measuring instrument,this article explains the design scheme,structure principle and component selection basis of the instrument.It discusses the additional error of the measurement results caused by the local circuits,with a quantitative estimatation of the size of the error,and provided counter measures in this regard.Eventually,the analysis of the test error calculation proves that the measuring instrument has met the measurement accuracy requirements.

关 键 词：电阻 误差 测量精度 

分 类 号：TM13[电气工程—电工理论与新技术]