Guralp Systems CMG-5T Compact - Manual (Page 11)

Operator's Guide
The current offset values will display. Once the process has completed
the Scream! status window will display (in green):
CENTERING COMPLETE
Note: if you enter the command CENTRE or CENTER the process will
still take place but the values will not display.
2.4.3 Removing offsets using a third party digitisers
To remove offsets while using third party digitisers, connect pin U on
the sensor connector to pin Y (see section 5 on page 24). Note that the
sensor must be powered while performing this operation.
The connection between pins U and Y must be maintained for seven
seconds before the centring function is activated. The connection
must then be released. Centring will continue for as long as is
required after the connection is broken,
2.5 The hand-held control unit
The 5T Compact can be supplied with an
optional hand-held control unit (HCU).
This is a portable device which provides
easy access to the seismometer's controls,
as well as displaying the output
acceleration on an analogue meter. The
5T Compact uses the same HCU as Güralp
5TB and 40T instruments but there are a
few differences. The output from the 5T
Compact is acceleration not velocity so, to
view the high gain acceleration, select the
'HIGH VEL' switch and to select the low
gain acceleration select the 'LOW VEL'.
The 5T Compact also doesn't output the
mass position and has no electronic
centring so these parts of the HCU should
be ignored.
2.5.1 Signal meter
The upper section of the HCU contains a simple voltmeter for
monitoring the signals from the instrument.
•
To monitor the low-gain outputs, switch the dial to V, N/S or E/W
LOW VEL according to the component you want to monitor.
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