AT89C51单片机电信号测量仪设计+电路图+源程序

摘要在通信、测量技术、计量以及仪器等领域上，正弦波、方波、三角波、锯齿波的应用也越来越广泛，在实验研究中对信号参数的测量也变得十分重要，尤其对电信号的频率、幅值的测量更为重要。以单片机为核心的电信号测量的装置精度高、易于携带、便于技术的更新，因而本课题采用主要控制器件为AT89C51的单片机进行设计和实现一个可以对输入信号的频率和幅值进行测量的电信号测量仪。22397
由于课题精度要求较高，故频率测量时将被测信号通过整形放大电路，利用单片机进行脉冲计数直接测量频率。幅值测量时先将信号通过峰值保持电路变换成与原信号幅值相等的直流电信号，进行A/D转换后通过单片机处理进行幅值测量。最后通过LCD显示模块对信号的测量结果进行显示。
关键词单片机电信号测量 LCD A/D转换
毕业论文设计说明书（论文）外文摘要
Title    The Design Of Electrical Measuring Instrument
Abstract
In the Communication，Measurement Techniques ,Instrumentation Measurement and other fields,waves such as sine、 square、 triangle and sawtooth are increasingly being used in experimental studies.So measure parameters of the signals become very important , especially for electrical frequency and amplitude. SCM as the core of electrical measuring devices have a lot of advantages ,such as high- precision, easy to carry, the technology easy to update.So in the reacher of the measurement of electrical signal,we use the AT89C51 SCM as the main control device,which can design and implement the frequency and amplitude of the input signals.
This task requires the measurement of the signals should has high precision.So we directly measure the number of pulses as the frequency of the measured signal. And When we measure the amplitude,we first transform the original signal to DC signal which has equal amplitude. Then after the process of A/D conversion ,we put the signal to the MCU in order to measure the amplitude. Finally, through LCD1602 module to display   measurement results.
Keywords SCM    Electrical Signal    Measurement LCD
          The A/D conversion
目次
1 引言    1
1.1 电信号测量仪概述    1
1.2 电信号测量仪的发展方向    1
1.3 设计电信号测量仪的任务和要求    1
1.3.1 课题研究的目的    1
1.3.2 课题研究的任务    2
1.3.3 课题研究的要求    2
2 电信号测量仪的设计方案及论证    2
2.1 频率测量方案     2
2.1.1 传统方法测量频率     2
2.1.2 频率计方法测量频率     2
2.1.3 两种测频方法比较     3
2.1.4 频率测量结构图     3
2.2 幅值测量方案     4
2.2.1 采样法测量幅值     4
2.2.2 峰值检波法测量幅值     4
2.2.3 变交流为直流法测量幅值     4
2.2.4 三种测幅方法比较     4
2.2.5 幅值测量结构图     5
2.3 频率和幅值测量系统结构框图     5
3 模块设计    6
3.1 频率测量模块    6
3.1.1 信号放大电路模块    6
3.1.2 信号放大电路类型    6
3.1.3 信号整形电路模块    8 AT89C51单片机电信号测量仪设计+电路图+源程序:http://www.751com.cn/tongxin/lunwen_15008.html