The principle, composition and characteristics of virtual instrument are briefly described.

Answer: The principle of virtual instrument is to use the computer as the unified hardware platform of the instrument, make full use of the intelligent functions of the computer, such as calculation, storage, playback, call, display, file management, etc., and at the same time, software the specialized functions and panel control of the traditional instrument to form an instrument system that is exactly the same as the traditional instrument in function and appearance, and make full use of computer resources.

The composition of virtual instrument: instrument hardware, computer and application software.

The characteristics of virtual instrument are: short technical update period; The key is software; Low price, strong reusability and reconfiguration; User-defined instrument function; Open and flexible, can keep pace with computer technology; It is an application-oriented instrument system, which can be easily interconnected with networks and other peripheral devices.