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分析了电容式纤维长度仪的基本电气性能特点.提出了用有机玻璃条作为校验规检验电容极板线性度与均匀度的方法.用该校验规在6台纤维长度仪上测量,给出了其测量结果与统计分析值.证明了6台仪器及设计的校验规是稳定的,用这种方法校验是有效的.“,”Basic electric properties and characters of capacitance fibre length tester is analysed in this paper.By means of using plexiglass rod as verificating tool,the method of checking linear and eveness of capacitance extreme board is proposed.The results nad statistical values measured in 6 fibre length tester show that 6 testers and verificating tool are suitable and effective.