Guralp Systems CMG-DCM build <10,000 User Manual
Page 101
Acquisition Modules and Platinum Firmware
Digitiser Configuration
8.1.1.1 Identity
The first section displays the digitiser's identification string and serial
number, which can be edited. It also displays the digitiser's software version:
System identification / Serial number: Make any desired changes and then
click on the
button at the bottom of the screen. If the
digitiser is running in dual serial mode, both serial numbers are displayed on
this screen in separate rows.
8.1.1.2 Connected devices
Sensor type: Has no effect on the acquisition module's operation and acts as a
memo field.
Timing source: Set to “NMEA protocol GPS” (which should be used for all
GPS devices) or “None”, for situations where there is no timing source.
GPS power-cycling: GPS units can be turned off to save power in
battery-powered environments. In order to keep the internal clock
synchronised, the GPS unit is regularly turned on for long enough to obtain
an accurate time and then turned off. The GPS power-cycling drop-down
allows you to select the intervals at which this happens (1, 2, 3, 4, 6, 8, 21 or
24 hours) or whether to leave the GPS constantly powered up.
Mass auto-centring: The drop-down menu can be used to configure (or
disable) a digitiser function which automatically initiates a round of centring
when the mass position (averaged over several minutes) drifts further than the
specified distance from zero. The excursion required to trigger centring is
expressed as a percentage of full scale.
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Issue E - February 2014