Guralp Systems CMG-DM24 - Manual (Page 36)

CMG-DM24
The DM24 can be set up for triggered output, that is, to output certain
data streams only when a particular trigger criterion is met. The trigger
criterion can be tested with data from the same or some other stream.
For example, you could use a later tap (with a lower sample rate) as a
trigger for output from an earlier, more detailed tap. Scream! 4 also
allows you to configure each digitizer to receive triggers from other
digitizers.
To create a new stream with a trigger, open Scream!'s Digitizer
configuration window for the relevant digitizer, and click on the
Output control tab. In the Output control pane, a tap which gives rise to
a triggered stream has a tick in the lower row of its grid of check-boxes.
You cannot configure the trigger criteria until you have selected at
least one stream to be affected by the trigger.
Once you have decided which streams should be output when the
trigger is activated, you will be able to click on the Triggering button
to describe the trigger condition. Alternatively, click on the Triggering
tab at the top of the window. Either action will open the Triggering
pane:
There are two triggering algorithms which Güralp digitizers can use.
However, not all models can use both methods. Scream! will
interrogate the digitizer to discover which methods are supported by
its on-board software.
In addition, some digitizers support external and software triggering.
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