数字万用表毕业设计论文

精品文档---下载后可任意编辑本次设计用单片机芯片 AT89s52 设计一个数字万用表，能够测量交、直流电压值、直流电流、直流电阻以及电容，四位数码显示。此系统由分流电阻、分压电阻、基准电阻、电容测试芯片电路、51 单片机最小系统、显示部分、报警部分、AD 转换和控制部分组成。为使系统更加稳定，使系统整体精度得以保障，本电路使用了 AD0809 数据转换芯片，单片机系统设计采纳 AT89S52单片机作为主控芯片，配以 RC 上电复位电路和 11.0592MHZ 震荡电路，显示芯片用 TEC6122，驱动 8 位数码管显示。程序每执行周期耗时缩到最短，这样保证了系统的实时性。关键词： 数字万用表； AT89S52 单片机； AD 转换与控制精品文档---下载后可任意编辑AbstractThis design is design a digital universal meter with chip AT89s52 of one-chip computer, can measure and hand in , direct current pressing value , direct current flow , the direct current is hindered, four numbers show. This system is shunted resistance, resistance of partial pressure, basic resistance, minimum system of 51 one-chip computers, shown that some , warning part , AD change and control making up partly. In order to make the system more steady, make the whole precision of the system be ensured, this circuit has used AD0809 data to change the chip, the one-chip computer system is designed to adopt AT89S52 one-chip computer as the top management chip, the electricity is restored to the throne the circuit and 11.0592MHZ and shaken the circuit to match on RC, show that the chip uses TEC6122, urge 8 numbers to be in charge of showing. The every execution cycle consuming time of procedure contracts to get shortest, in this way the real-time character of the security system. Keyword： Digital universal meter； AT89S52 one-chip computer AD changes and controls 精品文档---下载后可任意编辑目 录摘 要……………………………………………………………………………………iAbstract…...