由于DAC和齿轮减速比都影响着伺服系统的开环增益，当系统开环增益一定时，DAC位数的实际作用和减速比的选择相互限制，在设计雷达伺服系统中需注意。
When the open-loop gain of servo system is determined, the selection of DAC resolution and gear ratio is restricted each other and should be paid much attention in the design of servo system.
减速器的主要参数包括：输入功率、减速比、输入转速、齿轮参数等。
The main parameter that decelerates a machine include: input power, decelerate a ratio and input to turn soon, wheel gear parameter etc.
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