摘要
本文介绍了微小电阻的测量技术,拟采用数字锁相环技术提取被噪声淹没的有用信号,通过多点测量及数据处理达到测试要求。该测量装置以计算机为核心,配以高精度A/D转换器、低噪声放大器和精密恒流源,对被测电阻上的信号电压进行放大、采样,最后利用数字锁相技术,计算出电阻的值,具有测量时间短,精度高,误差小等特点。已通过MATHCAD仿真试验,证明该方案可行,以及在全国电解铝行业中具有的社会经济效益。
This paper introduces the measurement technology of small resistance , the writer plans to use the digital phase-lock link technology to withdraw useful signal which is submergenced by noise, and the method meets the test requirements through the multispots measurement and the data processing. This measurement equipment takes the computer as a core,is matched by high accuracy A/D switch 、low noise amplifier and precise permanent current source, and enlarges and samples the signal voltage of the resistance w...
出处
《微计算机信息》
北大核心
2008年第4期89-90,共2页
Control & Automation
基金
仪器科学与动态测试教育部重点实验室微小电阻测试项目资助
关键词
微小电阻
数字锁相
电磁屏蔽
micro ohm resistance
digital lock in
electromagnetic screen
