Guralp Systems CMG-DM24 - Manual (Page 9)

Operator's guide
6. Press R to reset the disk.
7. When the reset is complete, remove the disk.
You will now be able to download data onto the disk when required.
2.4 The DM24BH borehole digitizer
When the DM24 is ordered in borehole form, it is supplied with a
surface interface unit for installation at the top of the borehole. This
unit takes the single data cable from the downhole digitizer and
provides standard connections for other equipment.
The connectors provided are:
•
a SENSOR connector - a 10-way mil-spec socket carrying serial
data, GPS and power to the sensor;
•
a GPS connector for attaching to your GPS receiver; and
•
a POWER / HOLELOCK connector which can either be connected
to a source of 12 – 30 V power for supplying to the borehole
instrumentation (including sensors), or to a Holelock Control
Unit for driving the sensor's hole lock motors. It is not usual to
power the sensor and hole lock simultaneously; once the hole
lock is engaged, you should remove the Holelock Control Unit
and cabling so that the sensor cannot be removed.
•
On the reverse side, a standard 9-pin RS232 connector is
provided for connecting to a PC running Scream! using a
straight-through serial cable.
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