Guralp Systems CMG-DM24 - Manual (Page 14)

CMG-DM24
Some DM24 modules, known as “6-channel digitizers”, are designed
for use with two instruments simultaneously, connected to the ports
SENSOR A and SENSOR B. These digitizers actually have 7 full rate
data channels, including the auxiliary/calibration channel. When you
enable calibration on these digitizers, the signal is passed to both
instruments. All 7 channels share the same settings for the four output
taps.
A 6-channel digitizer will output full-rate streams with the following
final characters:
Z/N/E0 SENSOR A at tap 0 Z/N/E1 SENSOR B at tap 0
Z/N/E2 SENSOR A at tap 1 Z/N/E3 SENSOR B at tap 1
Z/N/E4 SENSOR A at tap 2 Z/N/E5 SENSOR B at tap 2
Z/N/E6 SENSOR A at tap 3 Z/N/E7 SENSOR B at tap 3
Z/N/EG SENSOR A at tap 0,
triggered
Z/N/EH SENSOR B at tap 0,
triggered
Z/N/EI SENSOR A at tap 1,
triggered
Z/N/EJ SENSOR B at tap 1,
triggered
Z/N/EK SENSOR A at tap 2,
triggered
Z/N/EL SENSOR B at tap 2,
triggered
Z/N/EM SENSOR A at tap 3,
triggered
Z/N/EN SENSOR B at tap 3,
triggered
X/C0 Auxiliary at tap 0 X/C1 Auxiliary at tap 1
X/C2 Auxiliary at tap 2 X/C3 Auxiliary at tap 3
Standard 6-channel digitizers have the same 8 Mux channels as their
3-channel counterparts: M8, M9 and MA for the mass positions of
SENSOR A, and MB to MF for your own equipment. These digitizers are
designed for use with a strong-motion instrument or geophone
attached to SENSOR B, and so do not expose the mass positions for
this sensor. In addition, SENSOR B cannot be locked, unlocked, or
centred.
Optionally, a digitizer can be supplied which provides 5 additional
Mux channels M3 to M7 for external equipment (again exposed on the
AUXILIARY connector). 6-channel DM24 modules with this option also
measure the mass positions of SENSOR B, if available, and output
these on streams ending M0, 1 and 2.
14 Issue N