Guralp-systems CMG-1T Manuel d'utilisateur télécharger pdf (Page 24)

CMG-1T Ocean Bottom Seismometer Operator’s

Guide

Section 5, Page 2 September, 1999,

Issue C

The required method of zeroing the bowl tilt is provided diagrammatically in the

drawing below. The radial and azimuth adjustments are done until the 2 axes

inclinometer outputs are brought as close to zero as possible. The radial offset

tilt magnitude is calculated from the X, Y readings of the inclinometer and the

azimuth position is determined from the sign information of the inclinometers.

Two sets of position sensors fitted to the motor shafts transmit the digital shaft

position signals to a micro-processor to enable precise radial and azimuth

movement without slippage. In fact, the position detectors are absolute and

provide position information without losing information when the system is

switched off.

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Guralp-systems CMG-1T Manuel d'utilisateur Page 24