基于虚拟仪器的测试信号模拟系统设计

摘要

现有电子装备电路结构复杂、集成度高、数量少和购买费用高,对其进行测试性验证非常困难;为了提高装备的测试性水平,采用PXI总线的虚拟仪器技术对测试信号进行模拟,系统的硬件部分由相应型号的板卡组成,软件部分使用Pspice电路仿真软件对电路进行仿真,产生测点信息,并使用虚拟仪器编程软件Labwindows/CVI进行测点信息提取,控制虚拟仪器生成测试信号,以此来代替实际装备进行测试性验证;该系统的实际输出信号与测点仿真结果保持一致;可应用于测试性验证,为提高装备的测试性提供指导.%It' s hard to demonstrate the testability of the present electronic instruments because they have complex circuit construction, high integrity and high purchasing expense. In order to enhance the level of equipment' s testability, we adopt the VI technology based on PXI bus to simulate test signal. The hardware is constituted of corresponding cards and the software is implemented using Pspice software. The Pspice software is used to simulate the circuit. The Labwindows/CVI is used to pick up the test information from test point and control VI to generate test signal. This system can demonstrate the testability instead of real equipment. The output signal of this system is accord with the simulation of test point. This design is able to provide guidance in testability demonstrate to enhance the level of testability.