数字频率计的讨论Digital frequency of research学 生: 专 业：电子信息工程 班级 学号： 指导 老师： 学 院: 电子信息工程 摘 要数字频率计是专门用于测量信号频率的装置，并用十进制数显示。数字频率计是一种传统的测量仪器，广泛应用于学校教学、工厂和公司中。它不仅可以测量正弦波、方波和尖脉冲信号的频率，还能对其它多种物理量进行测量。例如机械振动频率，转动体的转动速度等，均可先转换成电信号，然后用频率计测量。本设计采纳的数字频率计是专门用于测量信号频率的装置，并用十进制显示，它具有测量迅速、精度高、技术方便等优点。它不仅可以测量正弦波、方波和尖脉冲信号的频率，而且还能对其它多种物理量进行测量。系统用 MSC—51 单片机作为控制核心，门控信号由定时计数器产生，但由于单片机的技术频率有采纳限，所以需要高频信号进行硬件分频处理，AT89C51 完成运算、控制及显示功能；为克服通用数字电路集成度低、电路安装布局不便的缺点，采纳CPLD 完成逻辑处理功能，使电路大为简化；用模拟输入通道实现信号的自动增益控制计较宽的测频范围关键词: CPLD 频率计 AT89C51 VHDL MSC—51ABSTRACTDigital frequency meter is used to measure the signal frequency devices, and decimal number display. Digital frequency is a kind of traditional measuring instrument, widely used in teaching, factories and schools in the company. It not only can measure sine pulse, and pointed the pulse signal frequency, it can also on other measure multi-physical quantity. Such as mechanical vibration frequency, rotating speed of the rotation, etc., to convert, and then use frequency signal measurement program.This design USES digital frequency meter is used to measure the signal frequency devices, and that, it has the decimal measurement, high precision and fast technology convenience etc. It not only can measure sine pulse, and pointed the pulse signal frequency, but also to other measure multi-physical quantity. System using MSC - 51 SCM as control core, door control signals generated by timing c...
