【摘要】 采用简化的方法确定锁相回路的极限环频率极限，推导出捕捉带的一般表达式；这用该方法在某一典型的控制模型上仿真得到的结果与采用传统相平面图方法确定系统的捕捉带的结果完全一致．该方法步骤简便、参数调整直现，在转台性能测试中具有较强的实用价值．更多还原

【Abstract】 The simplified method has been adopted to confirm the limit frequency of limit circle of phase-lock control loop. The general expression of the capture band has been derived. The result, that is obtained by using this method to simulation in a kind of typical control model, is complete1y equal to the result of capture band of system which is produced by using traditional phase iconography method. The method is simple, convenient and audio - visual, and is of great practical value in testing table function.更多还原