Virtual Instrument Technology and Development - Virtual Instruments, trends - Electrical industry

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[Abstract]: Virtual instrument is based on the computer hardware and software by adding Formed with visual interface of the instrument.





Virtual instrument can completely break the traditional instruments defined by the manufacturer, the user can not change the situation, allowing any user can easily flexible buttons with the mouse or the computer display screen on the operation of the various virtual instrument soft panel "knob" for testing, and testing requirements can be adopted according to different window switch different virtual machines, or by modifying the software to change, change the functions of virtual instrument system and scale. This virtual instrument can be developed with and excellent scalability features make the virtual instrument with great vitality and competitiveness.
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Virtual instrument consists of three major components of a highly efficient software. Virtual instrumentation software is the most important part. Use the right software tools, and by design or call the specific program modules, engineers can efficiently create their own applications as well as a friendly man-machine interface. NI provides industry-standard graphical programming software --- LabVIEW, not only easily accomplished with a variety of hardware and software to facilitate the connection, but also provides a powerful follow-up data processing capability, set the data processing, conversion, storage means, and the results displayed to the user. Additionally, NI offers more interactive measurement tools and more high-level system management software tools to meet customer demand for high performance applications.





2, modular I / O hardware. Today the face of increasingly complex test and measurement applications, NI offers a full range of hardware and software solutions. Whether the user is using the PCI, PXI, PCMCIA, USB or 1394 bus, NI can provide the corresponding modular hardware products, product categories from the data acquisition, signal processing, sound and vibration measurement, vision, movement, instrument control, distribution Type I / O to the CAN interface, and other industrial communication, everything. NI hardware products combine high performance and flexible software development can be responsible for test and design engineers to create complete customized measurement systems for unique applications. At present, NI has achieved every two days to introduce a hardware speed, greatly expanding the user the choice of surface.





Third, for integrated hardware and software platform. NI first proposed design for test tasks PXI hardware platform, has become the test, measurement and automation applications, standard platform, its open architecture, flexibility and cost advantages of PC technology for measurement and automation industry a a radical change. Initiated by the NI PXI Systems Alliance has attracted 68 companies, the number of products under the Union has increased to nearly one thousand species.





1 hardware 1.1 card machines


Traditional instruments mainly by the control panel and the internal processing circuit; the card itself without the instrument panel instrument, it must use the computer a powerful graphical environment, create a graphical virtual panel, complete instrument control, data analysis and display. Data-acquisition card, for example, typically have A / D converter, D / A conversion, digital I / O and counter / timer functions, and some with digital filtering and digital signal processing functions. Multifunction data acquisition card is used more, "the virtual hardware (VirtualHardware, referred to as VH) technology, it's thought from programmable devices, so users can easily change the program's functionality or performance of the hardware parameters, which rely on hardware devices flexible to enhance its applicability and flexibility. currently available in the VH, its sampling rate and precision are variable.





Card machines as closely combined with the computer, make full use of existing computer resources, cheaper than the traditional equipment, using more flexible, more powerful, so it is a great potential of the instrument types.





1.2 bus technology 1.2.1 Instrument Bus





GPIB bus (that is IEEE? 488 bus) is a digital parallel bus, primarily used to connect test equipment and computers.