With the improvement of complicated object level measurement and user on the measurement of how easy it is to request, the traditional electronic measuring instrument already can not meet the customers in the late eighty s, the development of the virtual instrument technology and gradually be regarded and get large-scale USES, virtual instrument technique is based on the computer software platform new class of measurement and control technology. Electronic instrument technology is modern measuring technology and computer control technology of the high speed development of product, will gradually replace traditional electronic instrument measurement technology
In this paper, the design thought of virtual instrument, and designed a kind of declan platform based on the parameters of the aviation comprehensive test of virtual instrument system, describes the detailed the system design principle and design process. The system adopts the development company production PCL 818 l the data acquisition card, make the data acquisition and output. The system includes signal generator signal analyzer two big subsystem, the user can also according to the actual needs of the software defined it directly through a function to the realization of the system is easy to the expansion of the function. Use declan software system development has a strong flexibility, fully embodies the "software" is the new thought, the instrument to break the traditional instrument structure fixed function of a single, scalability and poor restrictions