电子测试
電子測試
전자측시
ELECTRONIC TEST
2013年
9期
45-46
,共2页
电阻测试%AD574%高精度%误差分析
電阻測試%AD574%高精度%誤差分析
전조측시%AD574%고정도%오차분석
resistance test%AD574%high precision%Error Analysis
本文给出了一种以STC89C54RD为控制核心的高精度自动电阻测试仪的设计,系统量程为10Ω到10MΩ,具有自动切换量程和自动筛选的功能.采用恒流测压以及恒压测流相结合的方法,同时采用高精度运放OP07及精密电阻确保测试电路测量的精度.为了避免高阻测试时的工频干扰,采用12位的高速AD574进行模数转换,既保证测量速度又达到了数字滤波的效果.此外,本文还阐述了整个系统的误差来源以及减少误差、提高精度的办法.
本文給齣瞭一種以STC89C54RD為控製覈心的高精度自動電阻測試儀的設計,繫統量程為10Ω到10MΩ,具有自動切換量程和自動篩選的功能.採用恆流測壓以及恆壓測流相結閤的方法,同時採用高精度運放OP07及精密電阻確保測試電路測量的精度.為瞭避免高阻測試時的工頻榦擾,採用12位的高速AD574進行模數轉換,既保證測量速度又達到瞭數字濾波的效果.此外,本文還闡述瞭整箇繫統的誤差來源以及減少誤差、提高精度的辦法.
본문급출료일충이STC89C54RD위공제핵심적고정도자동전조측시의적설계,계통량정위10Ω도10MΩ,구유자동절환량정화자동사선적공능.채용항류측압이급항압측류상결합적방법,동시채용고정도운방OP07급정밀전조학보측시전로측량적정도.위료피면고조측시시적공빈간우,채용12위적고속AD574진행모수전환,기보증측량속도우체도료수자려파적효과.차외,본문환천술료정개계통적오차래원이급감소오차、제고정도적판법.
This paper presents the design of STC89C54RD as the control core high-precision resistance tester,the system range from 10Ω to 10MΩ,with autoranging and AutoFilter function.Using a combination of methods the constant current manometry as well as the constant pressure flow measurement,while using high-precision operational amplifier OP07 and precision resistors to ensure the accuracy of the test circuit measurements.In order to avoid the high impedance test frequency interference,12-bit high-speed the AD574 analog-to-digital conversion,both to ensure measurement speed and reach of digital filtering effect.Additionally,this article describes the sources of error of the entire system and reduce errors, improve the accuracy of the approach.
