Guralp Systems CMG-1T User Manual
Page 14
CMG-1T Ocean Bottom Seismometer Operator’s
Guide
Section 2, Page 2 September 1999,
Issue C
The adjustments required for operation consist of levelling the boom of the
vertical sensor and tilting the bases of the horizontal sensors to centre the
movements in their equilibrium positions. These adjustments are made by small
DC motors operating through gear trains to tilt the bases of the horizontal
sensors and to apply a small extra force to the vertical sensor’s boom.
For transportation the masses have to be locked securely in their frames, taking
the strain off the support hinges. The locking is performed by a small motor
driven clamp in response to a control command.