Study On Virtual Instrument Of Electric Parameter Measurement

Electric parameter measurement is one of the important means that analyzes and checks the characteristics of electric network, investigates phenomena, improves the design of network layout, and is one of the important assurance for the realization of auto-checkout and auto-control. So it is significant to develop high-powered electric parameter measurement instruments. At first, the paper curtly introduces the present status and developing trend of the investigation of electric parameter measurement instruments at home and abroad, then analyzes the software and hardware architecture of virtual instrument, and the advantages over the hardware-based congener instrument, subsequently expatiates on the software and hardware architecture design and the development process of two typical electric parameter measurement instruments in detail, viz. virtual sweeper and virtual digital multimeter, finally brings forward particular and objective evaluation.By using the function principle, software and hardware system design experiences of sweeper and digital multimeter based on hardware congener instrument for reference, this paper develops virtual sweeper and virtual digital multimeter successfully with vivid graphics and powerful function on the platform of PC-DAQ by dint of object-oriented software developing language VC#.NET. They can output manifold user-defined fixed or swept signal, check the frequency response characteristics of unknown electric network, measure alternating or direct voltage, alternating or direct current and resistance value, and so on. They have not only the same functions of hardware-based congener instrument, but also have the advantages of low-cost, the integration of signal sampling and processing, the visualization of data and results.Engineering practice makes know that every technologic guideline items of two typical electric parameters testing virtual instruments reach or exceed that of the hardware-based congener instrument in certain items. The two virtual instruments have advantages of powerful function, high precision, excellent efficiency, low cost, abilities of opening and spreading, can substitute for hardware-based congener instruments and are feasible for popularization. Furthermore, it makes know the software is a pith of virtual instruments, stands out that the practical application value of electric parameters...