The external hardware trigger is only a start trigger. It does not monitor the signal continuously and start/stop based on the signal.
Within DASYLab, use a software trigger, such as the Pre-Post Trigger or the Combi-Trigger Module, in combination with a Relay Module, to monitor the signal and remove the undesired values.
See the Hands On Guide or the online Getting Started Guide for examples of the Trigger modules and how to use them with the Relay.
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www.mccdaq.com and click on the "Support" tab for all support options, including DASYLab.