Guralp Systems CMG-3TB - Manual (Page 22)

CMG-3TB
To measure the attitude of a 3TB instrument:
1. Connect the inclinometer monitor unit to the CONTROL
connector of the breakout box.
2. Switch the ON/OFF switch on the monitor unit to the ON
position. The inclinometer is powered separately from other
parts of the system; this switch provides power to the downhole
circuitry as well as to the monitor unit. The inclinometer should
not normally be powered up whilst the sensor is in use.
3. Read off the X and Y components of the tilt from the analogue
meters.
4. If both tilts are within the green shaded region, the instrument is
close enough to vertical that it can be levelled and centred
successfully. If either output is in the red shaded region, you
should not attempt to unlock or centre the sensor masses.
Instead, if possible, you should move the instrument within the
borehole to a place where it can lie closer to vertical.
If you need to use the outputs of the inclinometer for some other
purpose, you can also connect a multimeter to the banana sockets on
the inclinometer monitor unit.
2.6 Operating the hole lock
The hole lock, if fitted, can be extended and retracted using the hole
lock control unit:
22 Issue C