【正文】 ts, analyze data, and present results to the user. And because LabVIEW has such a versatile graphical user interface and is so easy to program with, it is also ideal for simulations, presentation of ideas, general programming, or even teaching basic programming concepts. Labiew feature continuously enriched and powerful, Labiew used for data acquisition and control, data analysis and data representation, so that engineers and scientists to take full advantage of PC functions, quickly and easily plete their own power to make. Labview main features can be summarized as follows: a graphical environment for two instruments into a builtin program piler, so that run faster three flexible means of four supports multiple debugging platform 5 supports DDE functions. Labiew years of development from 1986 to now, has launched a number of different versions that can support multiple popular operating systems, Labview main course of development are as follows: years in April, Labview Development System in the United States Austin, Texas, the successful development of in May, NI introduced the Labview Beta test version in October, NI pany officially released the for Macintosh version of the in January, came in August in support of SUN Solaris workstation and PCLabview version available in January, version is developed in February, version available, this version is a milestone in the history of Labview years, Labview7Express and Labview 7 Series start into the market, in the Labview 7 series, introduced a new data type Dynamic Data Types years, Labview 8 version of the interview, the version of the specific distributed, intelligent outstanding features , the 20th anniversary edition of Labview an interview. is the Chinese version of in August, available in August, version available After 20 years of continuous innovation, development, Labview to rely on the concept of a new and unique advantages, and has maintained an efficient and powerful, and open the three basic characteristics, and gradually bee the industry standard. The above describes the characteristics of Labview and development, described below how the kind of virtual instrument design Typically, a virtual instrument design steps are as follows: (1). In the design window, place the front panel controls, front panel using the tool template development window, the corresponding tools, from the control template and place a good access control is needed to carry out parameter setting control properties, stickers text description tag. (2). In the flow chart editing window, place the nodes, frame, in the flow chart editing window, use the tool template corresponding tools, from a functional template and put a good access to the required icon, they are the flow chart in the nodes , frame. (3). The data flow programming, data flow using the connection tool according to the direction of the port, node, frame in turn connected to data from the source sent to the prescribed purpose terminal operating mode. (4). Run test, when the pletion of step (a), (2), (3), the front panel procedure and flow chart graphic design program is pleted, a virtual instrument has been basically established, whether to achieve the desired functionality, need to run the test. There are two kinds of test methods. a. Simulation Test: do not use I / O interface hardware. I needed to run tests on the signal data is from array or signalgenerating function, resulting emulation signal. b. Measured test: it is through the I / O interface to hardware devices, gathering input standard signal, to test the virtual instrument capabilities. Simulation test in experimental tests carried out prior to the virtual instrument unique advantage because of its repeated testing, debugging, and constantly improve the improvement of virtual instrument is extremely convenient, is a traditional instrument can not be used in test methods. (5).debugging techniques, use the toolbar shortcut Run, highlight the implementation of, Step, Breakpoint set to the following steps to program debugging. a. to identify grammatical errors, if there is a syntax error, then when start the Shortcut Bar Run button, the button bees a broken arrow, the program can not perform. Mouse click on the button, a list will pop up an error window, the window listed in the wrong item, an