Guralp Systems CMG-3EX-EAM - Manual (Page 8)

CMG-3EX-EAM Digital Broadband Seismometer
charged. Failure to do this may result in the auto lock function failing
and damage to the sensor.
The auto-lock feature is enabled at the factory but can be disabled if
desired.
To disable or re-enable the auto lock function hold down both the blue
centre and green unlock button, then press the black enable button
until the red LED illuminates continuously. This sequence toggles the
sensor between auto-lock enabled and disabled. Both busy LEDs blink
together continuously to indicated the sensors' mode. The sensor
should not be in a fault state prior to enabling this function. Details of
LED states can be found in section 3.2 on page 8.
3.1.5 Auto Centre
The instrument has an automatic centre function that will centre the
sensor massse if their position exceeds a set threshold.
To enable and disable the auto centre function hold down both the
blue centre and the red lock buttons, then press the black enable
button until the red LED illuminates continuously. This sequence
toggles the sensor between auto-centre enabled and disabled. Both
busy LED's blink together continuously to indicated the sensors' mode.
The sensor should not be in a fault state prior to enabling this
function. Details of LED states can be found in section 3.2 on page 8.
When Auto centre is enabled the sensor will initiate a centre operation
if the mass position of any component exceeds the threshold
continuously, for a set Delay period.
The default threshold is set to +/-1000 counts which is +/-50% full
scale. The delay period is set to 10 which equates to around 10
minutes.
3.2 Busy LEDs
The busy LEDs show the various states of the instrument. To do this
they illuminate and flash in different sequences. The status LED
sequence is based on 8 time segments that are repeated Either LED
can be on or off during each time segment. The table below explains
the LED states. A series of symbols are used to show when the LED is
on or off.
Here the symbol  will indicate the led is off during a time segment
and the symbol  or  will indicate that the red or green LED is on.
8 Issue A