摘要：随着当今社会的飞速发展，电路的集成化和小型化已经成为主流。我们都知道庞大的电路可能出现各种各样的故障，这就需要我们准确测量电路中的某个电阻的大小或者某一条线路的电流大小以检测故障所在。如果用以往的方法测电流就需要把线路截断然后在中间串接电流表，测电阻就需要把电阻的引脚焊下，这样的测量方式既容易破坏电路，测量误差又大。最近几年，在线测量技术凭借其简单可靠的特点，逐渐进入了人们的视野。在线测量技术也叫做等电势差隔离技术。它可以在保证电路完好的情况下准确测量印制线路板上的电流和电阻等参数。因此，在线测量技术不仅实用性强而且为故障检测和设备检修提供了全新的方法。
关键词 在线测量 运算放大电路 单片机 A/D转换
毕业设计说明书外文摘要
Title Design of on line current and resistance measurement system based on single chip microcomputer
Abstract：With the rapid development of today's society, the integration and miniaturization of circuits has become the mainstream. We all know that a large number of circuits may be a variety of faults, which requires us to accurately measure the size of a resistor in the circuit or the current of a circuit to detect the fault location. If the measured current by the method requires the line block is connected in series with a current in the middle of the table and then, we need to measure the resistance welding pin resistance, measuring way is easy to damage the circuit, measurement error is big. In recent years, online measurement technology has gradually entered people's vision because of its simple and reliable characteristics. The online measurement technology is also called potential isolation technology. The utility model can accurately measure the current and the resistance on the printed circuit board under the condition that the circuit is in good condition. Therefore, on-line measurement technology is not only practical, but also provides a new method for fault detection and maintenance.
Keywords On-line measurement Operational amplifier circuit Singlechip A/D conversion
目 次
1 绪论 1
1.1课题背景介绍 1
1.3本文主要内容简介 2
2 电流电阻在线测试技术原理 3
2.1电流在线测量技术原理 3
2.2电阻在线测量技术原理 4
3 硬件电路设计 5
3.1电流在线测量电路设计 5
3.2电阻在线测量电路设计 8
3.3差动放大电路设计 9
3.4微处理器STM32最小系统电路设计 10
3.5 JTAG调试电路的设计 11
3.6 LED指示灯及按键控制电路设计 12
3.7 LCD1602液晶显示电路设计 12
3.8串口通信电路设计 14
3.9电源系统设计14
4 软件系统设计 17
4.1测试系统软件结构设计 17
4.2量程自动切换的程控实现… 19
4.3硬件驱动程序设计 20
5 实验及误差分析… 21
5.1实验过程及结果… 21
5.2测试数据误差分析 22
结论 … 23
致谢 … 24
参考文献 25
1 绪论
1.1 课题背景介绍
测量是人类对客观事物取得数量概念的认识过程，是人们认识和改造自然的必经途径。对于任何被研究的对象，若要定量地进行分析，都必须通过测量来实现[1]。
基于单片机的在线电流电阻测量系统设计:http://www.chuibin.com/zidonghua/lunwen_206397.html