通过对编码器真值表的特点分析，利用卡诺图最小项合并规则得出了直接书写逻辑表达式的具体方法。
Through to the encoder truth table characteristic analysis, has obtained the direct writing logical expression concrete method using the Karnaugh map most minor term merge rule.
文中从实际诊断中出发首次将IEC - 60599三比值故障诊断表编写成对应的逻辑编码表，然后应用粗糙集理论构造决策表并对决策表进行约简，最后建立改进的新导则IEC - 60599三比值故障诊断决策规则。
Firstly, a logical diagnostic table of IEC-60599 is presented, and a decision table can be constructed by applying the Rough Set Theory based on the IEC-60599 three-ratio fault diagnosis table.
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