The Design and Implement of Virtual Instrument Based on Computing Technique and USB Platform

most of the traditional measuring instrument were designed and implemented by complicate hardware circuit. It made the product very expensive, thin functional and terrible big body, which limited the usage and precision of the instrument. Nowadays more and more new powerful measuring instruments are made for more accurate measurement, the kernel of most instruments are made of special computer with appropriative software and hardware, so the price is higher than before, can't be accepted by common users. In order to solve the antinomy, we bring out a challenging solution, this solution is based on PC-personal computer, the most popular computing devices in the world, we make good use of the computing technique and universal serial bus platform with bits of hardware, user can acquire a modern measuring instrument which is powerful, flexible and low price. Because this kind of instrument hasn't specific physical status, most of its functions are implemented by software with good algorithms; it has a favorable price compared with other instrument. We called it virtual instrument. With this foundation, we made our instrument have the ability to learn by the method of engineering mathematics, and made a progress in system measure range and measurement accuracy. In the laboratory, we made a virtual measure instrument to implement a transistor measuring system, and get a notable result. Proof by facts, this solution has a good value for spreading. I. INTRODUCTION ACING the huge manufacturing industry of electronic products and designing industry of electronic products, the measurement and testament of electronic units become more and more important. Most of the traditional methods build their measuring environment by mass of analog electronic circuits, they have to build different measuring environment for different target units, it made the traditional instrument with big body, high price and limited functions. The high-end measuring instruments are equipped with special computers with adaptive software and hardware, though they have powerful functions, but their terrible prices make us far away from them. In order to solve the antinomy, with the fast development of the computing technique, we explore a new path to make modern measuring instrument: the virtual instrument based on computing