对 FD IM II 型新型刚体转动惯量测量仪进行了改进，从仪器的摆角，上下圆盘的高度，下圆盘水平3个方面进行改进，用改进后的仪器对圆环的转动惯量进行测量，从实验结果发现，改进后的仪器可以有效地减小实验误差。%In this paper ,FD IM II new type rigid body rotation inertia measuring instrument is improved .It was improved in three aspects :pendulum angle of instrument ,height of upper and lower discs ,the horizontal of lower discs . The rotation inertia of the ring was measured with the improved instrument .From the experimental results ,it is found that the improved instrument can effectively reduce the error of the experiment .
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