Guralp Systems CMG-40T - Manual (Page 7)

Operator's guide
The breakout box also provides a standard Güralp power connector on a 10-pin
mil-spec plug. The 40T draws a nominal current of 48 mA from a 12 V supply
when in use; thus, using a 12 V, 25 Ah sealed heavy-duty lead-acid battery, you
should expect the instrument to operate for around a week without recharging.
The CENTRE button switches the instrument into ACC/VEL mode whilst it is
pressed. This mode allows you to monitor the mass positions whilst you adjust
the offsets manually. If you prefer, you can use the equivalent switch on a
Handheld Control Unit (see below.)
The handheld control unit
This portable control unit provides easy access to the seismometer's control
commands, as well as displaying the output velocity and mass position (i.e.
acceleration) on an analogue meter.
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