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简述研制磁光盘机械特性测试仪的必要性，介绍径向测试可供选择的几种方案，并进一步提出光栅定标过道信号的测试方法。
The necessity of developing the tester of mechanical properties of magneto-optical disk is briefly introduced. Several options of radial test are introduced, and the test method of grating calibration aisle signal is further proposed.