基于at89s52单片机智能多用表设计毕业论文.docVIP

PAGE PAGE \* MERGEFORMAT2 摘要 电学参数测量技术涉及范围广，特别是微电压、微电流、高电压以及待测信号强弱相差极大的情况下，既要保证弱信号的测量精度又要兼顾强信号的测量范围，在技术上有一定的难度。传统的低成本仪表在测量电压、电阻时都采用手动选择档位的方法来转换量程。在使用中，当忘记转换档位时，会造成仪表测量精度下降或损坏。 现代电子测量对系统的精度要求越来越高且智能化程度也越来越高。全量程无档自动量程转换电压表和电阻表是在保证测量精度不下降的前提条件下省去手动转换量程的工作，得到了广泛应用。 本文介绍了一种基于AT89S52单片机的智能多用表。该表能在单片机的控制下完成直流电压、电阻和直流电流的测量。测量电流部分采用了简单的I/V转换电路完成测试；测量电压部分结合模拟开关CD4051和运算放大器OP07构成程控放大器，实现了自动量程转换；测量电阻部分也由模拟开关CD4051和运算放大器OP07相结合，在单片机控制下完成了自动量程转换。电流、电压和电阻的最终测量信号都在单片机的控制下由12位A/D转换器TLC2543进行采集，采集的信号经单片机数据处理后通过LCD（12864）显示出来，测量结果还可以由带有串行EEPROM的CPU存储器和监控器的X25045进行多个数据保存。 　　关键词：TLC2543 自动量程转换 程控增益放大器 电压　电阻　电流 Abstract The electricity parameter measuring technique involves the area to be broad, specially micro voltage, micro electric current, high voltage as well as in testing signal strong and the puniness discrepancy enormous situation, both must guarantee the discrepancy signal the measuring accuracy and to give dual attention to the strong signal the measuring range, technically has certain difficulty. Traditional low cost measuring appliance when measurement voltage, resistance uses the manual choice files position the method to transform the measuring range. In use, when forgot transform the files position, will cause the measuring appliance measuring accuracy to drop or the damage. The modern electronic surveying to systems accuracy requirement is getting higher and higher, and the intellectualized degree is also getting higher and higher. The entire measuring range does not have the files automatic measuring range transformation voltmeter and the ohmmeter is in the guarantee measuring accuracy does not drop under the prerequisite omits the manual transformation measuring range the work, obtained the widespread application. 　 This article introduced one kind based on AT89S52 monolithic integrated circuits intelligent multipurpose meter. This meter can complete the DC voltage, the resistance and the direct current measure under monolithic integrated circuits control. The me