水平失真触发：当信号变高或者变低，并保持此状态超过指定时间时触发。这是很有用的对于脉冲串的末端触发。
Level dropout: This detects an edge followed by a specified time with no edges. It is useful for triggering on the end of a pulse train.
水平失真触发：当信号变高或者变低，并保持此状态超过指定时间时触发。这是很有用的对于脉冲串的末端触发。
Level dropout: This detects an edge followed by a specified time with no edges. It is useful for triggering on the end of a pulse train.
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