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本文提供了一种使用复合矩形脉冲信号测取时间常数较大的工业自动化对象的频率特性的方法，其特点在于每次测试可同时得到三组数据。
This paper presents a method of using complex rectangular pulse signals to measure the frequency characteristics of industrial automation objects with large time constants, which is characterized by three sets of data simultaneously for each test.