Guralp Systems CMG-3T - Manual (Page 33)

Operator's guide
•
the left-hand two sockets expose the balanced differential
outputs representing ground velocity, and
•
the right-hand socket exposes the mass position (acceleration)
output.
Ground references for each of these voltages are provided at the
bottom of the unit. Ensure that you do not connect either side of a
differential output to ground.
4.3 Integrated State-of-Health Controller
The CMG-3TD variant (a CMG-3T with an
integrated DM24 digitiser) is available with an
optional, in-built state-of-health controller.
This option provides a simple means to centre,
lock and unlock the masses without the need for
a hand-held control unit.
The lid of the device is fitted with four
momentary, colour-coded push-buttons, labelled
“ENABLE” (black), “CENTRE” (blue), “UNLOCK”
(green) and “LOCK” (red) - together with a red
LED, labelled “BUSY”.
These buttons are used in a similar manner to
those on the break-out box with the exception
that it is not necessary to hold the buttons down
for seven seconds - one second is adequate.
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