Guralp Systems CMG-3EX-EAM - Manual (Page 7)

Operator's Guide
The two LED's, on the right in the illustration above, provide an
indication of the instruments status.
3.1.1 Unlock
To initiate the unlock function hold down the green unlock button,
then press the black enable button and release both after
approximately 10 seconds. The internal processor will now perform
the task of unlocking the sensor. There are several stages to this and
the green LED shows the progress. If an error is encountered during
the unlock process, the red LED will flash at the end of the operation.
The precise pattern of flashing indicates the fault encountered. Details
of LED states can be found in section 3.2 on page 8.
3.1.2 Centre
To initiate the centre function hold down the blue centre button, then
press the black enable button and release both after approximately 10
seconds. The internal processor will now perform the task of centring
the sensor. The green LED flashes during the centre process and then
stays on once the centre is successful. If an error is encountered during
the centring process, the red LED will illuminate at the end of the
operation. The precise pattern of flashing indicates the fault
encountered. Details of LED states can be found in section 3.2 on page
8.
3.1.3 Lock
To initiate the lock function hold down the red lock button, then press
the black enable button and release both after approximately 10
seconds. The internal processor will now perform the task of locking
the sensor. There are several stages to this and the green LED shows
the progress. If an error is encountered during the locking process, the
red LED will illuminate at the end of the operation. The precise
pattern of flashing indicates the fault encountered. Details of LED
states can be found in section 3.2 on page 8.
3.1.4 Auto Lock
The sensor has an automatic lock feature to ensure that the sensor is
always locked when transported. If power is removed from the sensor
for more than thirty seconds, an internal NiMH battery provides
enough energy to initiate an automatic locking sequence.
Note: If the sensor has been left standing powered off for expended
periods of time (>3months) the sensor should be left powered for at
least 48 hours before deployment to ensure that the internal battery is
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