介绍了一种提取电路最佳可测性参数集以诊断电路故障的新方法。利用灵敏度法分析了电路中故障元件和可测性参数之间的关系,推导出由电路可测性参数表示的故障元件容差最大值和最小值的表示式,得到诊断故障元件的最佳可测性参数,最后利用数据优化算法得到电路故障诊断的最佳可测性参数集。利用所介绍方法分析了一个低通滤波器电路,得到诊断该电路故障的最佳参数集。由于只需较少的可测性参数即可完成电路的故障诊断,因此本方法不仅计算简单,而且可有效地缩短测试时间和降低测试成本。 A new method to extract the best testable parameter set of the circuit to diagnose the circuit fault is introduced. The relationship between the fault element and the measurable parameters in the circuit is analyzed by using the sensitivity method. The expressions of the maximum and the minimum of the fault tolerance indicated by the measurable parameters of the circuit are deduced. Test parameters, and finally use the data optimization algorithm to get the best testable parameter set of circuit fault diagnosis. A low-pass filter circuit was analyzed using the method presented to obtain the best set of parameters for diagnosing the circuit failure. The circuit fault diagnosis can be completed with less testable parameters. Therefore, the method not only has simple calculation but also can shorten the test time and reduce the test cost effectively.