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  本文選題：數(shù)字存儲示波器(DSO) + 模數(shù)轉換器(ADC)��； 參考：《電子科技大學》2014年碩士論文

【摘要】：示波器是電子工程師的眼睛,是使用最廣泛的測量儀器。選擇示波器作實踐教學系統(tǒng),幫助儀器專業(yè)的學生了解儀器系統(tǒng)的構成,硬件設計的關鍵模塊,儀器互連的接口技術,有很強的現(xiàn)實意義。本課題圍繞“示波器實踐教學系統(tǒng)設計與實現(xiàn)”主題,基于典型數(shù)字存儲示波器結構,提供了一套可聯(lián)機調試的示波器實踐教學實驗板,該實驗板具有:信號通道調理電路,觸發(fā)電路,數(shù)據(jù)采集電路,DSP處理器,網絡接口。通過該實踐教學系統(tǒng)不僅可以幫助學生學習綜合應用本科所學的數(shù)字電路,模擬電路,微機原理相關知識,更重要的可以幫助學生建立現(xiàn)代測量儀器系統(tǒng)的概念,建立網絡化自動測試系統(tǒng)的概念。在設計該實踐教學系統(tǒng)時,系統(tǒng)原型參照當前典型示波器指標,適當降低其實現(xiàn)難度。系統(tǒng)的信號調理通道由無源衰減網絡、阻抗變換、可控運算放大和帶寬限制等電路組成,通過系統(tǒng)中該電路模塊,學生可進行信號調理通道特性相關實驗;觸發(fā)電路包括衰減網絡、耦合方式選擇、邊沿觸發(fā)、視頻觸發(fā)等,通過該電路可進行觸發(fā)通道特性相關實驗;該系統(tǒng)使用可控采樣芯片進行數(shù)據(jù)采集,可根據(jù)需要實時切換采樣芯片工作模式,通過該電路可進行采樣數(shù)據(jù)校準實驗和多種數(shù)據(jù)采集模式的實驗;系統(tǒng)采用可編程邏輯芯片實現(xiàn)示波器采集系統(tǒng),通過該部件可進行數(shù)字邏輯系統(tǒng)設計試驗;使用以DSP為處理器的嵌入式系統(tǒng)來進行采樣數(shù)據(jù)分析處理,通過對該處理器編程試驗,可培養(yǎng)學生嵌入式軟件系統(tǒng)設計能力;該系統(tǒng)引入基于網口的儀器擴展功能,提供可操作的遠程控制命令接口,學生可在該接口硬件平臺下,設計并驗證儀器程控功能;更進一步,可在實驗板上實現(xiàn)自動測試系統(tǒng)中LXI-C類儀器所需的Web服務器,幫助學生掌握B-S網絡程序設計。系統(tǒng)提供了各實驗的參考設計,并全部驗證通過。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM935.3-4;G642

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