production progress.Virtual instrument have many advantages such as high performance scalabilitystrong development time is short and seamless integration. 3、graphical virtual instrument development platform-LABVIEW introduction and itsadvantages LABVIEW is short for Laboratory Virtual Instrument Engineering Workbench itis a powerful and flexible instrumentation and analysis of application development tool created by National Instruments National instruments IN 。Labview is agraphical programming language mainly used to develop data acquisition instrumentcontrol and data processing and analysis software. Currently the development ofsoftware is popular in the international test measurement and control industry measurement and control areas in the country has also been widely used. FunctionGenerator is a generic instrument widely used in scientific research and engineeringdesign。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 compiler generates 32bits compiled program to ensure that user data acquisition test and measurement solutions for high-speed implementation. 5. Include the functions of the communication bus in DAQ GPIB PXI VXI RS-232/485 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 Internet capabilities support for common network protocols to facilitate networking 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
become the most popular trends.
4、The development direction of virtual instrument As a new instruments the advantage of the virtual instruments is thatuser-defined functions and structure of the instrument and easy to build Conversionflexible it has been widely used in electronic measurement acoustic analysis faultdiagnosis aerospace mechanical engineering construction Engineering railwaytransportation biomedical and many other aspects of teaching and research. With thedevelopment of computer hardware and software technology communicationstechnology and network technology providing a vast world of the development of thevirtual instrument Chinese and foreign equipment sector is the large market.Monitoring equipment will be the efficient high-speed high precision and highreliability and automation intelligence and network direction. Open standards fordata collection will put instrument on a standardized universal serial and modularway. The virtual instrument as a new teaching tool has been slowly walked into theclassroom and laboratory and is gradually changing the traditional mode of electronictechnology teaching which is the inevitable development of modern educationaltechnology. In the construction of electric and electronic laboratory some laboratoryequipment have been conventional aging some have technical backward in thecurrent school funds under the circumstances of less If buy regular instrument andmeter it is difficult for the school to pay for it and it is not fit with the school’ssituation. Moreover with the test equipment digitalized computerized trend thetraditional test instruments have the trend been gradually replaced. If the virtualinstrument technology computer-based building integrated test platform instead ofconventional instruments meters not only to meet the needs of electrical andelectronic experimental teaching and will these computer courses on computer can beused as teaching other machines greatly improving Equipment utilization reducingthe cost of laboratory construction. The current should be addressed is how to makevirtual instruments and existing instruments together and tap the potential of existingequipment to phase out and replace the traditional instrumentation . In short thevirtual instrument has a broad space for development and ultimately to replace thelarge number of traditional instruments into the mainstream of the field
instrumentation products as measurement analysis control automation instrumentcore. 5、 Signal Generator Overview Signal generator signal generator also known as signal source or oscillator is akind of equipment to provide a variety of frequency waveform and output levelsignal the signal source used for testing or excitation. It has been widely used in thescience and technology and production practice. With the development of modernelectronics computers and signal processing technology Advancing digitaltechnology in the application of electronic measuring instruments so that the originalanalog signal processing gradually being replaced by digital signal processing toexpand the instrument signal processing Capacity improved signal measurementaccuracy precision and speed of change to overcome the many shortcomings ofanalog signal processing digital signal generators were developed together. Thefunctions of traditional signal generators are carried out solely on hardware and at thesame time the functions of traditional signal generators are singleness and costly forpurchasing and maintaining What is more important is that the functions oftraditional signal generators can not be altered once they are fixed. Users must getnew ones so long as they want new functions. Thus the defects of traditional signalgenerators are obvious. Virtual instrument is the instrument technology computertechnology bus technology and software technology closer together the use ofpowerful digital computer processing power to achieve most of the functions theinstrument breaking the traditional instruments of the framework the formation of a new instrument model .
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