Research on the testability analysis and evaluation method based on model

Whether the design for test of product meets the testability requirements should be analyzed and evaluated.The method based on model is widely used because of its advantages in product testability analysis.Depending on the main components and functions of the multilayer system,this paper puts forward a testability modeling method based on dependency matrix and multi-signal model.It analyzes the key element of testability model and builds up two corresponding models.By simulation and evaluation with Testability Engineering and Maintenance System(TEAMS),the model was improved to accord with the transitive relation between the function and the fault model of real system.Then the better design for test and diagnosis strategy was provided.A multilayer equipment electronic system was taking as an example for testability analysis and evaluation.The conclusion shows that this method can meet the need,its feasibility and validity proves.