Abstract
This paper describes a new approach for fault diagnosis of analog multi-phenomenon systems with low testability. The developed algorithms include identification of ambiguity groups, fault diagnosis methodology and solving low testability equations. Our aim is to identify a minimum number of faulty parameters that satisfy the test equations called a minimum form solution. An algorithm to find a minimum form solution is presented, which is based on the solution invariant matrix and an identification of singular cofactors of this matrix. System simulation using a developed Cpp and Matlab programs was performed to test different faulty circuits. Test examples are discussed and simulation results are presented.
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