The results show that the approach is effective compare with the basic fault dictionary approach, the diagnosis effect can be enhanced greatly.

与基本的故障字典法相比，在很大程度上提高了诊断效率。

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According to the characteristic of circuits which exist tolerance, this paper improves the fault dictionary approach and presents a new method-overlap set approach.

本文根据存在容差时电路的特点，对现有的故障字典法作了改进。

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The approach of fault dictionary often needs to simulate all fault states and extracts corresponding character of circuit , then setup the dictionary by corresponding relation.

故障字典法通常需要在测前仿真各种故障状态，提取出与故障状态相对应的电路特征，再将两者一一对应关系列成一个表，即为字典。

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