我觉得这篇文章适合吧： 基于AT89C51的金属材料电阻率测量仪 <<中南工业大学学报(自然科学版)>>2000年 第31卷 第06期 作者: PauI M D， 丁家峰， 曹建， 期刊-核心期刊 ISSN : 1005-9792-(2000)06-0506-04 以AT89C51微处理器为核心组成智能型微电阻测量仪．该仪器依据四探针法原理，采用高稳定度的恒流源电路，低漂移、低噪声的直流放大器电路和自动量程转换电路构成测量回路．恒流源采用深度负反馈技术，其稳定度、电压调整率和温度漂移分别小于0．1％，0．1％和0．05％／℃．采用了分时测量、共同一测量回路的自校准方法，高稳定恒电流分时通过待测试样和内置标准电阻，电压测量回路的输入阻抗高达20MΩ以上，消除了试样接触电阻的影响．通过对高精度标准电阻器组BZ-3的检测表明，全量程中的最大非线性误差为0．12％，对各种标号的漆包线的测量误差小于0．5％，对金属试样在腐蚀液体中的腐蚀情况能进行动态监测，对大试样粉末冶金样品的微小电阻也能进行精确的测量 关键词: 电阻率， 恒流源， 微处理器 Instrument based on AT89C51 for measuring resistivity of metal materials Paul， M D | Ding， J F | Cao， J，- Journal of Central South University of Technology (China) (China) V 31， 6， 506- 26 D 2000 An instrument controlled by microprocessor AT89C51 for measuring the resistivity of metal materials was It is based on the principle of Four-point probe method and has a high stable constant current power source， highly sensitive， low noise， low drift DC gain amplifier， a highly resolution A/D converter and an automatic range selector controlled by microprocessor AT89C The constant current power source is constructed in degenerative feedback Its stability， voltage relative regulation and temperature drift are less than 1%， 1% and 05% In measurement process， the constant current follows R sub s and R sub x at a time sharing process and a method of online self-diagnosis was A serial of precise standard resisters BZ-3 was used to adjust the The results showed that the maximum error is less than 12% The error is less than 05% in measuring the resistivity of several kinds of enameled For large piece of metal samples with low resistance， the instrument can have accurate 如果不行，我帮你找别的吧。。
