Event Search is a very usefull function of your curve writer:
Use this dialog box to inspect a curve for specific events.
You describe an event with a level or the signal amplitude and the level duration. For example, DASYLab searches for an event with a level that exceeds 5 volt for at least 10 seconds.
Search Definition: Channel name — Specifies one data channel or all data channels in which DASYLab searches for the event.