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A automatic test system based on the VxWorks operating system is designed to meet the requirements for the real-time testing, universality and extensibility of the test system . The automatic test system is developed with industrial computer as the core of human-computer interaction operation. In the automatic test system, PXI chassis with PXI instrument board and zero slot controller is used to implement the testing process of signal exerting excitation and the measurement of the response signal. The system software that developed with virtual instrument technology is support for secondary development and parameters configuration. Standardized signal interface connector is used to guarantee the extensibility of the automatic test system.