Guralp Systems CMG-3ESP Installation - Manual

CMG-3ESP
Seismometer
Installation
Check you have all components and cables.
! CMG-3ESP weak motion broadband seismometer
! Thick grey signal cable
! Sensor calibration data booklet
You will need a suitable digitizer or recording equipment,
and a 12–24 V DC power supply.
For pit or posthole installations, follow the steps
overleaf.
Choose a suitable site to install the sensor.
The sensor should be mounted
- at, or ideally below, ground level
- away from sources of natural noise (e.g. wind, surf)
- away from sources of cultural noise (e.g. traffic)
- in contact with bedrock, if possible
- otherwise, on a hard granite or concrete pier
- in an environment with constant temperature
shielded from air currents (e.g. in a polystyrene box)
- away from electrical cables and appliances
Connect your digitizer or recording equipment according to
the directions supplied.
Loosen the brass locking nut on one of the adjustable feet.
Turn the foot, screwing it in or out to level the sensor. Check
using the spirit level on the sensor lid.
Repeat with the other adjustable feet, until the bubble in
the spirit level lies entirely within the inner circle.
Remove the screw cap protecting the vertical lock access
socket, and insert an Allen key. Find the retaining screw
within, and loosen it to unlock the vertical component.
Repeat for the north/south and east/west components.
Do not allow the instrument to tilt by more than 10° with
the masses unlocked.
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