| With the development of computer and software technique, virtual instrument has become the developing direction in test field, vibration test and analysis based on virtual instrument has become the trend of vibration test. So a vibration instrument system of multi-channel for vibration test and analysis is developed in this paper, which based on PC as hardware workbench, laboratory virtual instrument workbench (LabVIEW) developed by American National Instruments Corporation as software workbench, and essential sensors, signal conditioner and data acquisition card (USB2015). The system realizes the main function modes of instrument on the computer, completes data transform between computer and data acquisition card over the Universal Serial Bus (USB), and controls data acquisition, signal processing and display through the software in computer to meet the demand of vibration test and analysis in engineering. The system based on the mode structure not only could complete data acquisition and analysis in time and frequency domain, but also adds function of time-frequency analysis and Dynamic Balance for rotor. The system has all-round functions and good expansibility and high cost performance, it's easier to perform and fit for use of engineer.
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