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波形刷新率，也称为波形捕获率，是指每秒的波形刷新次数，以每秒波形数(wfms/s)表示。事实上，从信号采集到信号波形显示在屏幕上的过程是由几个采集周期组成的。捕获周期包括采样时间和停滞时间。模拟信号通过ADC采样和量化转换成数字信号，同时存储。整个采样和存储过程称为采样时间。示波器必须在开始下一次采样之前测量、计算和显示存储的数据，这被称为死区时间。在死区时间内，示波器没有采集波形。当一个捕获周期完成时，它将进入下一个捕获周期。捕获周期的倒数为波形刷新率，如1.1所示，波形刷新率= 1/(Tacq+Tdate)。

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