Guralp Systems CMG-DM24S12AMS - Manual (Page 16)

CMG-DM24S12AMS Operator's guide
GPS Type: The digitiser needs to be able to time-stamp accurately all
data that passes through it. It can set its clock either by receiving time
signals from the GPS satellite network using an attached Garmin GPS
unit, or by taking time information from a central site (stream sync
mode). In stream sync mode, the digitiser expects to receive GCF packets
from the central timing source (which may have its own GPS unit, or
take signals from one of the radio time standards).
Enable GPS power cycling: If you are using a GPS unit to receive time
signals, but do not experience significant drift in the system's clock (for
example, in a stable-temperature environment), you can save power by
selecting Enable GPS power cycling. With this option in use, the GPS
time is only checked at intervals of a specified number of hours.
Disabling this option keeps the GPS unit running constantly; if you have
ample power, this will give the most accurate results. You can choose
any whole number of hours for the interval.
Output control
The Output control tab allows you to configure which data streams are
sent to Scream! from each digitiser.
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