Abstract
With the fast development of micro-electronics technique, computer technique, network communication technique and software technique, the tradition instrument is in the direction development of the calculator .Virtual Instrument(VI) concept is producing exactly on the background like this kind of technique. The virtual instrument points to the personal computer instrument which has the virtual instrument front-panel. It makes use of the software to constitute the virtual instrument front-panel on the tiny machine , and proceeds to adopt the signal under the hardware's support, not only can proceed the signal analysis and show of the wave in real time, but can proceed the consequence in the memory under the off-line term every kind of software handle. By writing the software and installing the hardware , the virtual instrument can completely be defined by customer, in keeping with different applied environment with the object's every kind of function.
In the test realm, Spectrum Analyzer is a kind of important instrument in common. But processing craft of this kind of instrument is complicated, producing the instrument request high technique, the price is expensive. Adoption virtual instrument technique, we only need under the corresponding hardware support, then use the software to realize the virtual spectrum analyst instrument.
The paper presents the design and implementation of virtual spectrum analyst. This Virtual Instrument (VI) is designed using the graphical programming language LabVIEW and is capable of processing sine wave and square wave. It has many functions including the generation of sine wave and square wave, display and analysis in the time and frequency domains。The VI presents an user-friendly human-machine interface.
KEYWORDS:Virtual instrument, Virtual spectrum analyst, Graphic programming