文档介绍：摘要
随着高新技术尤其是电子信息技术的快速发展和工业自动检测控制水平及需要的不断提高,越来越多的检测器及正弦信号发生器进入到生产及工程、仪表测量、自动控制系统和教学实验等领域,同时因为其成本低、使用方便、频率和幅值可调等优点,在雷达系统、航空航天系统、通信系统中也得到广泛应用。但在某些条件苛刻的地方,依靠集成器件构成的正弦信号发生器的信号产生以及信号传输都很容易受到干扰,这给开发人员造成了很大困扰。特别是在某些存在易燃易爆物品的特定场所,在保证测量精度同时,还要考虑信号发生系统的稳定性、系统运行产生的电磁场对储存物质影响以及信号数据传输稳定性等问题。因此,一个简单有效的解决方案势在必行。
本设计采用MSP430F2617作为系统的检测和控制核心,实现各项数据的采集、处理以及输出显示。系统由电压信号采集、信号调理、二线式电流变送模块、电流转电压模块、AD采样模块、稳压电源、DDS模块、以及液晶显示等组成。通过电阻桥获得电阻对应电压差值,经放大及消除非线性后交由电流变送模块转化为电流信号做远距离传输;在控制端由I/V模块将电流信号转换为电压信号以便交由AD模块采样后送单片机;再由单片机根据采样值控制DDS产生与获得电阻对应频率的正弦信号输出,并在液晶屏显示采得电阻值。
关键词:正弦信号发生器电流变送 I/V变换 DDS
Abstract
With the rapid development of high and new technology, especially the electronic information technology and the industrial automatic detection control level and need greatly improving, more and more detectors and sine signal generators have applied into production and engineering, the meter measuring, automatic control system and teaching experiment, etc, and at the same time because of its low cost, easy to use, frequency and amplitude can be adjusted and other advantages, in a radar system, aviation system,munication system is also widely used. But in some strict place, which rely on ponents of the sine signal generator signal and signal transmission are easy to interference which caused very big trouble to in some specific places where inflammable and explosive items exist, it is not only need to ensure measurement precision but also need to consider the signal happen system's stability and the ic field’s influence to storage material which generated during the operation of the system and the signal data transmission stability and so on. Therefore, a simple and effective solution is imperative.
This dissertation based on microcontroller MSP430F2617,it’s used to detection the data and control each module’s work .It’s bination of the tow-wire system current mode resistance transmitting instrument ,I/V module,AD sampling, digital display scope and liquid crystal display mo