使用NI6612采集变化频率脉宽信号，最小脉宽是12us，最大140us，采样模式只能设置外部时钟，但设置外部时钟，又有采样频率必须低于信号频率的规则（否则报错-201314），如果设置采样频率低，则无法采集到完整的变化脉冲信号，求教是否有其他采样模式，能够实现我可以采集到每一个变化脉冲的脉宽时间？
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