Aimed at the problems of existing missile test equipment such as large size,complex structure,difficult maintenance and long test time,a portable test system based on PCI bus and virtual instrument technology was proposed.On the basis of analyzing the working principle of electro-hydraulic servomechanism,its mathematical model was deduced and established.The hardware design and selection of the test system were completed through the dynamic testing requirements of the servo mechanism.According to the principle of"modularization,standardization and miniaturization",the industrial computer was used to control the PCI-1742U multi-function data acquisition card,and realize the signal excitation and acquisition during the test process.Based on the Visual Studio soft-ware development platform,the dynamic test software was written to achieve the functions of excitation signal parameter setting,data acquisition,signal processing and data management in the testing process.Finally,the influence of sampling frequency on the test re-sults was analyzed through simulation test experiments based on the sine correlation analysis and chirp signal test method.
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