《基于STM32的数字化万用表校验仪开发》研究报告.doc

郑州铁路职业技术学院科研课题 《基于STM32的数字化万用表校验仪 课 题 组 成 员魏保立、徐 坚、王云飞、张凯、王平安 郑州铁路职业技术学院 二〇一三年三月 摘 要 万用表是电工必备的仪表之一， 每个电子工程师都应该熟练掌握其工作原理及使用方法。在教学实习中，通过本次万用表的原理与安装，要求学生了解万用表的工作原理，掌握锡焊技术的工艺要领及万用表的使用与调试方法。在万用表实训过程中同学们往往需要对自己制作的万用表进行校准，以便使自己装的万用表准确度更高。实训结束以后老师也要根据学生的制作情况来给学生打出成绩，我们不仅要学生的制作工艺还要对学生的万用表进行测试。 项目结合学校实训教学特点，针对万用表校验教学中的具体问题，如电压输出不稳，校验仪本身不能自校准，显示不清晰，器件老化精度降低等问题，提出在原有万用表校验仪的基础上进行升级改造，以便更好地为服务教学。 项目对整体方案进行了较严密的设计，为了实现预设的功能，对电阻档单元、电流档单元、电压档单元、控制电路单元及电源电路单元等进行了各种方案的论证对比，最终选取较经济、简单、实用的设计方案，实现了所需各项功能。项目对研究过程中的一些问题进行了总结，对后续功能的进一步开发提供了借鉴。 Abstract The multimeter is one of the necessary instrumentation electrician, each electronic engineers should master the principle and method of use. Often need to produce their own multimeter calibration table students training process in million, so as to make himself with a multimeter more accurate. After the teacher training according to the production situation of students to give students making results, we should not only see through the production process of students but also on the students of the multimeter test. The project combines the teaching characteristics of school training, the multimeter check specific problems in teaching, such as output voltage instability, checking instrument is not calibrated, display is not clear, the problem reduced precision devices such as aging, is proposed based on the original million meter calibrator on upgrading, in order to better service for the teaching. The project was designed more tightly on the overall plan, in order to realize the functions of presupposition, the resistance profile unit, current gear unit, voltage unit, control circuit unit and a power supply circuit unit of comparison and demonstration of various options, the final selection is an economical, simple, practical design, realizes the required function. The project has carried on the summary to some problems in the research process, further development of the subsequent function provides a ref