Guralp-systems CMG-3ESPCD Manual de usuario Pagina 12

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CMG-3ESPCD Digital Broadband Seismometer Installing the 3ESPCD
facing North. This can be done by rotating the base of the sensor whilst
observing it from above. The brass pointer can be found next to one of
the feet.
If you cannot easily see the pointers, you should align the sensor using
the north arrow on the handle. However, the alignment of the handle
with the sensors inside is less accurate than the metal pointers, so they
should be used wherever possible.
5. The top panel of the 3ESPCD includes a spirit level.
Level the sensor using each of the adjustable feet of the instrument in
turn, until the bubble in the spirit level lies entirely within the inner
circle. (The instrument can operate with up to of tilt, but with
reduced performance.)
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.
MAN-C3E-0002 12 Issue B - November 2013
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