Guralp Systems CMG-5TD User Manual
Page 20

Operation
5.9.3 Triggering
Once at least one box is checked for triggered output, the Triggering box and
tab are activated. If you set triggering, you must also set the parameters for
the trigger criteria.
The Data Source button selects the tap (streams) that will be evaluated for
triggers for both the STA/LTA and the Level triggers. In general, it is not
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Issue D - April 2013