Guralp Systems CMG-DM24 - Manual (Page 79)

Operator’s Guide DM-24 Digitiser
Issue G January 2003 77
13. CMG-DM24S12, 12 Channel Digitiser.
The 12-cannel 24-bit digitiser unit has been configured to operate single component
CMG-5U strong motion accelerometers. The housing of the digitiser is from high
impact copolymer polypropylene with external inputs mil.spec connectors fitted on to a
metal plate. The digitiser housing also has limited internal cable pocket to store cables
or documentation.
The operation of the 12 channel digitiser is identical to that o f the CMG-DM24 units,
for quick start please see section 2.3. This section will cover the operation of the
digitiser unit using the RS232 outputs of the digitiser. There are two separate RS232
outputs each operating 6 channels of the digitiser.
The 12 channel digitiser has the following inputs and outputs:
o 12 Channel differential inputs
o For each CMG-5U sensor, power is provided; this is 12 Volts, same as the
digitiser power supply.
o Each sensor attached to the digitiser can be calibrated with the digitiser
calibration signal.