【正文】 LABVIEW software development platform has the following advantages： 1. It use graphical programming approach, the designer do not need to write any code in text format, It is the true language of engineers. 2. It provides a wealth of data collection, analysis and storage of the library functions. 3. Provides both the traditional debugging tools, such as setting breakpoints, single step, while providing a unique tool for highlighting the implementation of that program to run the animation style, which will help designers to observe the details of running, so that debugging and development of more is convenient. 4. The 32bit piler generates 32bits piled program to ensure that user data acquisition, test and measurement solutions for highspeed implementation. 5. Include the functions of the munication bus in DAQ, GPIB, PXI, VXI, RS232/485 and other kind of equipment, making the developer who do not know the different bus stand can driver the interface devices and instruments 6. Provide a substantial amount of code or software for connecting external mechanisms, such as DLL (dynamic link library), DDE (shared libraries), ActiveX and so on. 7. Powerful Inter capabilities, support for mon work protocols to 中原工學(xué)院信息商務(wù)學(xué)院外文翻譯 16 facilitate working , remote monitoring and control equipment development. Graphical program programming is simple and intuitive, the development and high efficiency. With the continuous development of virtual instrumentation and graphical programming language, test and control areas will bee the most popular trends. The development direction of virtual instrument As a new instruments, the advantage of the virtual instruments is that userdefined functions and structure of the instrument, and easy to build, Conversion flexible it has been widely used in electronic measurement, acoustic analysis, fault diagnosis, aerospace, mechanical engineering, construction Engineering, railway transportation, biomedical, and many other aspects of teaching and research. With the development of puter hardware and software technology, munications technology and work technology, providing a vast world of the development of the virtual instrument, Chinese and foreign equipment sector is the large market. Monitoring equipment will be the efficient, highspeed, high precision and high reliability, and automation, intelligence and work direction. Open standards for data collection will put instrument on a standardized, universal, serial and modular way. The virtual instrument as a new teaching tool, has been slowly walked into the classroom and laboratory and is gradually changing the traditional mode of electronic technology teaching, which is the inevitable development of modern educational technology. In the construction of electric and electronic laboratory, some laboratory equipment have been conventional aging, some have technical backward, in the current school funds under the circumstances of less, If buy regular instrument and meter, it is difficult for the school to pay for it and it is not fit with the school’s situation. Moreover, with the test equipment digitalized, puterized trend, the traditional test instruments have the trend been gradually replaced. If the virtual instrument technology, puterbased, building integrated test platform, instead of conventional instruments , meters, not only to meet the needs of electrical and electronic experimental teaching, and will these puter courses on puter can be used as teaching other machines , greatly improving Equipment utilization, reducing the cost of laboratory construction. The current should be addressed is how to make virtual instruments and existing instruments together, and tap the potential of existing 中原工學(xué)院信息商務(wù)學(xué)院外文翻譯 17 equipment, to phase out and replace the traditional instrumentation . In short, the virtual instrument has a broad space for development, and ultimately to replace the large number of traditional instruments into the mainstream of the field instrumentation products, as measurement, analysis, control, automation instrument core. Signal Generator Overview Signal generator (signal generator), also known as signal source or oscillator, is a kind of equipment to provide a variety of frequency, waveform, and output level signal, the signal source used for testing or excitation. It has been widely used in the science and technology and production practice. With the development of modern electronics, puters and signal processing technology, Advancing digital technology in the application of electronic measuring instruments, so that the original analog signal processing gradually being replaced by digital signal processing to expand the instrument signal processing Capacity, improved signal measurement accuracy , precision and speed of change to overe the many shortings of analog signal processing, digital signal generators were developed together. The functions of traditional signal generators are carried out solely on hardware, and at the same time the functions of traditional signal generators are singleness and costly for purchasing and maintaining, What is more important is that the functions of traditional signal generators can not be altered once they are fixed. Users must get new ones so long as they want new functions. Thus, the defects of traditional signal generators are obvious. Virtual instrument is the instrument technology, puter technology, bus technology and software technology closer together, the use of powerful digital puter pro