Guralp Systems CMG-3ESPCD - Manual (Page 70)

CMG-3ESPCD Digital Broadband Seismometer Command line interface
Because of the way FORTH works, you can insert MINUTE commands into
SQUAREWAVE, SINEWAVE or RANDOMCAL commands, for example:
N/S 4 HZ 5 MINUTE SINEWAVE E/W 10 MINUTE SQUAREWAVE
6.5.5 %AMPLITUDE
Syntax: value %AMPLITUDE
Sets the relative amplitude of the signal, as a percentage. For SQUAREWAVE
and RANDOMCAL calibrations, the default of 100% is normally suitable. If you
have a high-gain sensor, you may have to use a lower value. For SINEWAVE
calibrations, you may have to adjust the %AMPLITUDE setting to suit the
frequency of the calibration signal.
You can insert %AMPLITUDE commands into calibration commands as
described above, e.g.:
Z 3 MINUTE 50 %AMPLITUDE RANDOMCAL
6.6 Actions
The commands in this section trigger specific actions, such as mass-locking.
6.6.1 LOCK
Syntax: LOCK
Locks the sensor mass of the instrument. Whilst this process is executing, the
system displays the mass position for each component, measuring one
position each second (i.e. one reading every 4 seconds for each component of
a 4-component instrument). The process returns when locking is complete.
The mass positions are measured to 16-bit accuracy, with full deflection
corresponding to values around ±32000 counts.
6.6.2 UNLOCK
Syntax: UNLOCK
Unlocks the sensor mass, and returns when unlocking is complete. The
system will display the mass positions as the process continues, as for LOCK,
above.
6.6.3 CENTRE
Syntax: CENTRE
Centres the sensor mass, and returns when centring is complete. The system
will display the mass positions as the process continues, as for LOCK, above.
When the mass is correctly centred, the readings should be less than ±1000
counts.
MAN-C3E-0002 70 Issue B - November 2013