Universal serial bus ( usb ) was first aimed at the shortcoming of traditional pc bus . usb has been used widely in data exchange and storage of pc peripheral and mobile fields because of its characteristics of relative high speed , supporting of “ plug and play ” , relative less requirement of resources 通用串行总线usb ( universalserialbus )的提出最初是为了解决pc上传统总线的不足,因其速度快、支持热插拔、占用主机资源少等优点广泛应用于pc外设和移动数据交换与存储。
As a main participator in the design and research of virtual digital storage oscilloscope ( vdso ) based on usb interface , the author regarded usb interface and digital storage oscilloscope as the main research object and researched the problem of data acquisition system ' s data transfering based on usb interface by the background of that research in this paper 本论文以作者参与的基于usb接口的虚拟数字存储示波器的设计研究为工程背景，以通用串行总线接口和数字存储示波器为主要研究对象，研究数据采集系统的usb数据传输方式问题。
To the hardware , the design is composed of two parts : the one is the part of data acquisition and wireless data sending and the other is the part of wireless data receiving and the interface circle of universal serial bus . to the functional model , the design is composed by the data acquisition , the wireless data transmission , the interface of universal serial bus , the device ' s driver and the application 本系统从硬件结构可分为两部分：数据采集及无线发送前端部分和无线数据接受及通用串行总线接口电路部分；从功能模块结构上可分为：数据采集模块、无线数据传输模块、通用串行总线接口模块以及设备驱动程序和应用软件模块。
This paper first begin with the connotation of virtual instrument technology , study and discuss the criterion and the working theory of usb deeply . on the principle of usb1 . 1criterion , using usb interface chip usbn9604 and low consumption mirochip c8051f231 , we designed the available interface of usb bus and its controlling software , turn the communicating function based usb bus between computer and testing device . second based on the developed interface of usb bus , using microchip pic16c62 and a mount of relays , we designed the multiswitching scanner and its controlling software to complete the funtion of accesses swithing in testing system . third calling the api function inside the windows using vb programming language , communicat with the impelling program of selected hid , achieve the function of testing instrument with usb interface , complete the development of upside software faced testing . at last , based on the deep studying of pcb testing method , used the developed multiswithing scanner and software faced testing , combinated with necessary testing instrument , we constructed the pcb testing system and analized the testing result simply 论文首先从虚拟仪器的技术内涵出发，深入研究和讨论了通用串行总线usb规范及工作原理，并依据usb1 . 1规范，采用usb接口芯片usbn9604和低功耗微处理器c8051f231设计开发了通用的usb总线接口及其控制固件，实现了通用计算机与测试设备之间基于usb总线的通信功能；其次，在所开发的usb总线接口的基础上，使用微处理器pic16c62和多路继电器开关，设计开发出实现测试系统中测试通道切换功能的多路通道扫描器及其控制固件；再次，采用vb语言编程，调用windows内部api函数，与选定hid类驱动程序进行通信，实现usb总线接口测试仪器功能，完成面向测试的上层软件开发；最后，在深入研究印刷电路板测试方法的基础上，利用已开发的多路通道扫描器和面向测试软件，结合必要测试仪器组建印刷电路板测试系统，并对测试结果进行了简要的误差分析。
Universal serial bus ( usb ) is a connectivity specification aimed at peripherals connecting outside the computer in order to eliminate the hassle of opening the computer case for installing cards needed for certain devices . usb provides for ease of use , expandability , and speed for the end user , so usb will become the next protocol standard of computer peripherals 通用串行总线( usb )系统是针对现有的计算机( pc )外围设备连接体制所具有的规格混乱、不支持热插拔等缺点而提出来的新一代pc通信协议，它具有高速、双向、同步、低成本、可动态连接等优点，将成为计算机新的接口标准。
In this paper , it was studied that how to use the universal serial bus ( usb ) evaluation card and some other hardware , combining the software , such as labview , vc + + 6 . 0 program language and others to make a usb data acquisition card . then , we made a single photon counter cell function analyzer using this card . it actualized automatic detection 本文主要研究通过usb ( universalserialbus ，通用串行总线)评估板等硬件、 labview 、 vc + + 6 . 0语言等软件平台开发研制了usb数据采集卡；并在此基础上设计、研制了超微弱发光单光子计数细胞功能分析仪，实现了相关检测的全程自动化测量。
The development of sclence , production and community have expounded demand to testing higher and higher . with the testing objects changing from a single static parameter to several active ones , even a group of active courses , apparatus have passed through the way of analog , digit , brain and virtual . that the technology and apparatus of testing will follow the develop tendency of computer has already popular in testing field . the virtual instrument has been mentioned for years , but it still in the stage of studying , discussing and probation . this paper try to use the universal serial bus popularity in personal computer as a core to constitution the virtual instrument testing platform , including understanding of criterion , studying of interface , manufacting of devices , develop of software and constructing of system and so on . the aim is to put the virtual instrument to applying quickly , using this new convenient , flexible , efficient and cheap method 科研、生产和社会的发展对测试提出越来越高的要求，随着测试对象从单一静态量发展到多个动态参量甚至一组动态过程，仪器仪表也走过了模拟、数字、智能和虚拟的发展道路，测试技术和仪器跟着计算机走的发展趋势已经成为测试界的共识。其中，虚拟仪器虽已提出多年，但仍处于研究、讨论与试用阶段。本文试图以当前pc机普遍配置的通用串行总线usb （ universalserialbus ）为核心，构建虚拟仪器测试平台。
