| Virtual instruments technology and soft sensing technology are two vital branches of the smart measurement and control technology; they are integrations of technologies in the fields of automation, measurement, microelectronics, computer science and communication, playing a very important role in our society. While their applications in the excitation characteristic test equipments promote the development of power test technology and power production greatly.The essay firstly discusses and analyses the virtual instrument technology, including its history, theory, and the VI development platform, VI software architecture and its application in the instrument developed by the essay. After that, the soft-sensing technology and its application in the instrument are given. Then, on the basis of analyzing various methods of measurement about excitation characteristic, the essay brings up the theory of the instrument. And then, we design our measurement instrument, emphasizing the hardware design, software programming, adaptive filtering based on the Differential Evolution algorithm and the error analysis. In the end, the essay summarizes the technologies in our measurement instrument and point out the research direction of the instrument.
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