Guralp Systems CMG-3TB - Manual (Page 17)

Operator's guide
scratching the other components.
2.5 Control units
The 3TB is operated from the surface through various control units. All
the 3TB's functions can be accessed through one or other unit. Most
can be removed from the site once the instrument is ready for use.
Some of these control units are optional and may not have been
supplied with your installation. Their functions can be duplicated
either by applying voltages directly to control lines (see appendixes for
pinout information) or through a connected Güralp digitizer such as
the CMG-DM24. The DM24 digitizer is able to pass commands to the
instrument from a Data Communications Module (DCM) or a computer
running Güralp Systems' Scream! software, allowing you to access all
of the instrument's functions remotely.
The breakout box
The breakout box is normally placed where the signal cable emerges
from the borehole. It provides connectors for attaching the various
other control units, supplies power to the instrument and relays output
signals to a recorder or digitizer.
•
The SENSOR connector is a 32-way mil-spec plug, and should
be connected to the borehole instrument with the cable
provided.
•
The RECORDER connector is a 26-way mil-spec plug. This
should be connected to an analogue data recorder or stand-alone
November 2006 17