Guralp Systems CMG-6T User Manual
Page 14
CMG-6T
7. The feet are mounted on screw threads. To adjust the height of a
foot, turn the brass locking nut anticlockwise to loosen it, and
rotate the foot so that it screws either in or out. When you are
happy with the height, tighten the brass locking nut clockwise
to secure the foot.
When locked, the nut should be at the bottom of its travel for
optimal noise performance.
8. Connect the grey sensor cable to the digitiser.
9. Connect a GPS receiver, a PC and a 12 V fused power supply to
the digitiser.
10.Run Scream! on the PC and check that data are being produced.
Optionally, also check the mass position outputs (streams
ending M8, M9 and MA.) These streams are digitized at a slower
rate, and may take up to 15 minutes to appear.
11.Cover the instrument with thermal insulation, for example, a 5
cm expanded polystyrene box. This will shield it from thermal
fluctuations and convection currents in the vault. It also helps
to stratify the air in the seismometer package. Position the
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Issue B