Guralp-systems CMG-3T Manual do Utilizador descarregar pdf (Página 39)

Operator's guide

Again, you can use the BUSY LED to monitor the progress of

unlocking.

1. The instrument checks to see whether the Z, N/S and E/W

masses are locked.

2. The instrument checks the N/S and E/W sensor bases.

3. The Z component is unlocked.

4. The N/S and E/W components are unlocked. These are quicker

than the Z component.

5. (see graph below) The N/S sensor base is unlocked, followed by

the E/W base. These processes take longer still.

• After unlocking, the instrument automatically performs a round

of centring (see below).

CENTRE

This command re-centres the masses. If the masses are clamped, or if

the sensor mass positions do not exceed ± 1.2 V, the CENTRE

command does nothing. Otherwise, it attempts to zero the output of

the vertical, N/S and E/W sensors in sequence by exerting small extra

forces on the boom. For the vertical sensor, a motor-driven adjuster

presses a small spring lever against the boom until the mass position

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Guralp-systems CMG-3T Manual do Utilizador Página 39