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The pressure switch test system, involving an important concept: the virtual instrument. Virtual instrument is the United States National Instruments Corporation (NI) out of the concept of modern computer technology and instrumentation technology in-depth integration of the product. Virtual Instrument \two virtual test and measurement and analysis. Virtual instrument is characterized by high-performance, scalability strong little development time, seamless integration. NI's withdrawal from a professional graphical programming software to design and development of virtual instruments, that is, Labiew.

LabVIEW, short for Laboratory Virtual Instrument Engineering Workbench, is a programming environment in which you create programs using a graphical notation (connecting functional nodes via wires through which data flows); in this regard, it differs from traditional programming languages like C, C++, or Java, in which you program with text. However, LabVIEW is much more than a programming language. It is an interactive program development and execution system designed for people, like scientists and engineers, who need to program as part of their jobs. The LabVIEW development environment works on computers running Windows, Mac OS X, or Linux. LabVIEW can create programs that run on those platforms, as well as Microsoft Pocket PC, Microsoft Windows CE, Palm OS, and a variety of embedded platforms, including Field Programmable Gate Arrays (FPGAs), Digital Signal Processors (DSPs), and microprocessors. Using the very powerful graphical programming language that many LabVIEW users affectionately call \(for graphical), LabVIEW can increase your productivity by orders of magnitude. Programs that take weeks or months to write using conventional programming languages can be completed in hours using LabVIEW because it is specifically designed to take measurements, 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 complete their own power to make. Labview main features can be summarized as follows: a graphical environment for two instruments into a built-in program compiler, 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:

1.1983 years in April, Labview Development System in the United States Austin, Texas, the successful development of

2.1985-year in May, NI introduced the Labview Beta test version

3.1986-year in October, NI company officially released the Labview1.0 for Macintosh version of the

4.1990-year in January, Labview2.0 came

5.1992-year in August in support of SUN Solaris workstation and PC-Labview version available

6.1993-year in January, Labview3.0 version is developed

7.1998-year in February, Labview5.0 version available, this version is a milestone in the history of Labview

8.2003 years, Labview7Express and Labview 7 Series start into the market, in the Labview 7 series, introduced a new data type - Dynamic Data Types

9.2005 years, Labview 8 version of the interview, the version of the specific distributed, intelligent outstanding features

10.2006, the 20th anniversary edition of Labview 8.20 an interview. 8.21 is the Chinese version of

11.2007-year in August, Labview8.5 available

12.2008-year in August, Labview8.6 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 become 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 \

(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 completion of step (a), (2), (3), the front panel procedure and flow chart graphic design program is completed, 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 \or \function,\resulting \

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