Guralp Systems CMG-DCM - Manual (Page 112)

CMG-DCM Data Communications Module
Tap #
Rate
(samples/s)
Bandwidth 1
(Hz)
Bandwidth 2
(Hz)
Bandwidth 5
(Hz)
2 0.1 – 0.9 0.2 – 0.9 0.5 – 0.9
3 25 1.25 – 11.25 12.5 – 11.25 6.25 – 11.25
10 0.5 – 4.5 1 – 4.5 2.5 – 4.5
5 0.25 – 2.25 0.5 – 2.25 1.25 – 2.25
4 0.2 – 1.8 0.4 – 1.8 1 – 1.8
2 0.1 – 0.9 0.2 – 0.9 0.5 – 0.9
1 0.05 – 0.45 0.1 – 0.45 0.25 – 0.45
As can be seen, the filter you choose defines the set of permissible
sample rates.
7.4 Auxiliary (“Mux”) channels
Güralp digitizers provide a range of slow-rate auxiliary channels for
reporting the system's state of health and other diagnostic information,
known as multiplexed (“Mux”) channels. The number of Mux
channels depends on the model and configuration of your digitizer.
Generally, three channels are used to report the sensor mass position,
and another measures the internal temperature of the digitizer. In
addition to these, up to 12 Mux channels may be supplied for the
user's own purposes. Some digitizers have a separate
AUXILIARY port
which can be used to access these channels.
You can choose which, if any, of these channels should be transmitted
to the DCM in the next section of the page. If one of the check-boxes is
ticked, the digitizer will output data on that channel to the DCM,
which will then store or transmit it with the rest of the data, according
to the way it is configured.
Since it is an optional feature, the digitizer may not use the Pressure
Mux channel to report pressure data. If this is the case, that channel
may be used for another purpose. Likewise, the three channels marked
Spare may not be used, depending on the optional features present in
the instrument.
For more information on the format of data packets transmitted on the
Mux channels, please refer to the documentation supplied with your
digitizer.
112 Issue F