摘要：本次毕业设计是针对简易频率计的设计，在设计过程中，所有电路仿真都是基于multisim10仿真软件。

　　　本毕业设计介绍了数字频率计的设计方案及其基本原理，并重点介绍了频率计各单元电路的设计思路，原理及仿真，整体电路的的工作原理，控制器件的工作情况。整个设计配以仿真电路图和波形图加以辅助说明。设计共有四大组成部分：一仿真软件Multisim10简介二是电路原理的设计，此部分讲解了电路的理论实现；三是仿真结果及分析，这部分是为分析电路是否按理论正常工作；四是性能测试，这部分用于测试设计是否符合任务要求。

关键字：频率计、时基电路、逻辑控制、计数、仿真软件

ABSTRACT:The graduation design is aimed at the simple digital frequency meter, in the design process, all circuit simulation are based on multisim10 simulation software.

　　　The graduation design introduces the simple digital frequency meter’ s design scheme and basic principle, and mainly describes the simple digital frequency meter is introduces each unit circuit design ideas, principles and the simulation, the working principle of the whole circuit, and the control devices introduces work. The whole design match with simulation diagram and waveform figure try to assist instructions. Design have four parts:firstly，the simulation software Multisim10’ s introduction; secondly，the circuit principle of design, this part are mainly explained the theory of circuit implementation; thirdly，the simulation results and analysis, this section is analyzed according to the theory for normal work whether circuit；fourthly, the performance test, this part used to test if the design meets mission requirements.

Key word: the simple digital frequency meter； time-base circuit；logic control；count；simulation software