基于虚拟仪器的电路板功能测试系统设计

发布时间：2018-03-01 17:05

本文关键词： 功能测试实装电路板 PXI总线虚拟仪器 Lab VIEW 数据采集　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：功能测试(Functional test,FCT)是对被测电路板提供模拟的运行环境(激励和负载),使其工作于各种设计状态,从而获取到各个状态的参数来验证被测电路板功能好坏的测试方法。一般专指实装电路板(Printed Circuit Board Assembly,PCBA)的功能测试。PCBA是指已经装配上各种电子器件的电路板,是电子产品的主要组成部分。对于一块电路板上不同功能的电路,如果采用传统的测量仪器,则需要使用不同的测量仪器,这样会增加测试系统复杂性。在分析国内外PCBA测试方法基础之上,本文设计了一种基于虚拟仪器开发软件Lab VIEW、NI板卡、PXI总线的PCBA功能测试系统。应用高速的PXI总线进行通讯的测试方案,可解决传统的测试方法速度低的问题;应用NI高速稳定的板卡的测试方案,主要是针对传统的测试方法可靠性、可维护性的问题;应用Lab VIEW开发软件,主要是针对传统的测试方法可持续开发性差、开发界面不友好的问题。硬件方面,在分析电路板功能测试系统的硬件模块的基础之上,以PXI总线、NI数据采集板卡、矩阵开关板卡为核心,设计了一种基于PXI总线的功能测试系统,该系统中包括PXI总线、18槽PXI总线机箱、数据采集板卡、矩阵开关板卡、程控电源、测试治具等硬件设备,能够满足系统数据采集的需求。软件方面,采用模块化编程思想,将系统分为五个功能模块。通过对板卡底层驱动的编程及参数调整,实现了对基本的电压、电流、频率等信号的测量要求;通过应用Active X技术实现了把测试结果运用报表显示出来。通过测试实例,证明了本文设计的FCT系统具有通用性强、可扩展性好、操作方便等特点。
[Abstract]:Functional testing (FCTT) is a simulated running environment (excitation and load) for the circuit board under test to work in various design states. In order to obtain the parameters of each state to verify the function of the circuit board being tested, we usually refer to the function test of printed Circuit Board assembly PCBA.PCBA refers to the circuit board that has been installed with various electronic devices. Is the main component of electronic products. For a circuit with different functions on a circuit board, if you use traditional measuring instruments, you need different measuring instruments. This will increase the complexity of the test system. Based on the analysis of PCBA testing methods at home and abroad, In this paper, a PCBA function test system based on Lab VIEWN NI board card PXIbus is designed. The test scheme of high speed PXI bus communication can solve the problem of low speed of traditional test method. The test scheme of using NI high-speed and stable card is mainly aimed at the reliability and maintainability of traditional test methods, and the application of Lab VIEW to develop software is mainly aimed at the poor sustainable development of traditional test methods. On the basis of analyzing the hardware module of the circuit board function test system, the core is the PXI bus NI data acquisition card and the matrix switch board card. A function test system based on PXI bus is designed. The system includes the PXI bus 18 slot PXI bus chassis, the data acquisition board, the matrix switch board, the program control power supply, the test tool and so on. In software, the system is divided into five functional modules by modular programming. The basic voltage and current are realized by programming the bottom driver of the card and adjusting the parameters. Through the application of Active X technology, the test results are displayed in the report form. Through the test example, it is proved that the FCT system designed in this paper has the characteristics of strong generality, good expansibility and convenient operation.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN407

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