Guralp Systems CMG-DM24 - Manual (Page 35)

Operator's guide
In this example:
•
DA79 is the serial number of the digitizer.
•
Stream Ids ending Z0, N0 and E0 correspond to input
channels Z, N, and E, with output derived from Tap 0.
•
Stream Ids ending Z4, N4 and E4 correspond to input
channels Z, N, and E, with output derived from Tap 2.
Scream! can replace these designations with more helpful
names if you wish: see the Scream! manual or online help for
more details.
•
DA7900 is the digitizer's status stream (notice its zero sample
rate).
Triggering
In its standard configuration, the DM24 outputs continuous data at a
sample rate you specify. In addition to this, Güralp digitizers can run a
triggering algorithm on the data they acquire. This allows you to
record data continuously at a relatively low sample rate, but record at
a much higher sample rate during short periods when the trigger is
active. The parameters controlling the triggering algorithm, and
controlling the data output once the system is triggered, are all
selectable by the user, permitting maximum flexibility of operation
and the most efficient use of available storage space.
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