Abstract
As the method of testability modeling and analysis, multi-signal flow model is now widely used. It can describe the certain dependency matrix between faults and tests, but it doesn't have the ability to describe the uncertain relation between faults and tests. In reality, the uncertain factors can be found everywhere in the process of testing, so the uncertainty of testing is taken into consideration in this paper. The fault detection rate and fault isolation rate can be calculated on the basis of the uncertain dependency matrix. The method proposed in this paper is verified by building the model of filter circuit.
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