示波器实践教学系统设计与实现

发布时间：2018-06-22 11:57

本文选题：数字存储示波器(DSO) + 模数转换器(ADC)　；参考：《电子科技大学》2014年硕士论文

【摘要】：示波器是电子工程师的眼睛,是使用最广泛的测量仪器。选择示波器作实践教学系统,帮助仪器专业的学生了解仪器系统的构成,硬件设计的关键模块,仪器互连的接口技术,有很强的现实意义。本课题围绕“示波器实践教学系统设计与实现”主题,基于典型数字存储示波器结构,提供了一套可联机调试的示波器实践教学实验板,该实验板具有:信号通道调理电路,触发电路,数据采集电路,DSP处理器,网络接口。通过该实践教学系统不仅可以帮助学生学习综合应用本科所学的数字电路,模拟电路,微机原理相关知识,更重要的可以帮助学生建立现代测量仪器系统的概念,建立网络化自动测试系统的概念。在设计该实践教学系统时,系统原型参照当前典型示波器指标,适当降低其实现难度。系统的信号调理通道由无源衰减网络、阻抗变换、可控运算放大和带宽限制等电路组成,通过系统中该电路模块,学生可进行信号调理通道特性相关实验;触发电路包括衰减网络、耦合方式选择、边沿触发、视频触发等,通过该电路可进行触发通道特性相关实验;该系统使用可控采样芯片进行数据采集,可根据需要实时切换采样芯片工作模式,通过该电路可进行采样数据校准实验和多种数据采集模式的实验;系统采用可编程逻辑芯片实现示波器采集系统,通过该部件可进行数字逻辑系统设计试验;使用以DSP为处理器的嵌入式系统来进行采样数据分析处理,通过对该处理器编程试验,可培养学生嵌入式软件系统设计能力;该系统引入基于网口的仪器扩展功能,提供可操作的远程控制命令接口,学生可在该接口硬件平台下,设计并验证仪器程控功能;更进一步,可在实验板上实现自动测试系统中LXI-C类仪器所需的Web服务器,帮助学生掌握B-S网络程序设计。系统提供了各实验的参考设计,并全部验证通过。
[Abstract]:Oscilloscopes are the eyes of electronic engineers and are the most widely used measuring instruments. It is of great practical significance to choose oscilloscope as the practical teaching system to help the students of instrument major to understand the composition of instrument system, the key module of hardware design and the interface technology of instrument interconnection. Based on the typical digital storage oscilloscope structure, a set of on-line debugging oscilloscope practical teaching experimental board is provided in this paper. The experimental board has the following functions: signal channel conditioning circuit. Trigger circuit, data acquisition circuit DSP processor, network interface. The practical teaching system can not only help students learn the related knowledge of digital circuit, analog circuit and microcomputer principle, but also help students to establish the concept of modern measuring instrument system. The concept of networked automatic test system is established. When designing the practical teaching system, the prototype of the system can be reduced by referring to the typical oscilloscope index. The signal conditioning channel of the system is composed of passive attenuation network, impedance transformation, controllable operation amplification and bandwidth limitation. Through this circuit module, students can carry out experiments on the characteristics of signal conditioning channel. The trigger circuit includes attenuation network, coupling mode selection, edge trigger, video trigger and so on. The working mode of the sampling chip can be switched in real time according to the need, the calibration experiment of sampling data and the experiment of various data acquisition modes can be carried out by this circuit, and the system uses programmable logic chip to realize the acquisition system of oscilloscope. The digital logic system design experiment can be carried out through this part, the embedded system with DSP as the processor can be used to analyze and process the sampling data, and the students' embedded software system design ability can be cultivated through the programming experiment of the processor. The system introduces the extended function of the instrument based on the network port and provides an operable remote control command interface. Students can design and verify the program control function of the instrument under the hardware platform of the interface. The Web server needed for LXI-C type instruments in the automatic test system can be realized on the experimental board, which can help students master B-S network programming. The system provides the reference design of each experiment, and verifies it all.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM935.3-4;G642

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