Guralp Systems CMG-DM24 User Manual

Page 34

CMG-DM24

In the example above, we might want the high-rate data from Tap 0 to

be generated only when an event registers. To do this, the lower check-
boxes of Tap 0 should be ticked:

With this configuration uploaded, Tap 2 will continue to produce

output at all times, but Tap 0 will also emit data whenever the trigger
criteria are met. The Triggering button is now shown in red to remind

you that the trigger is active.

When a trigger occurs, every checked box in this window will cause
the digitizer to output a data stream. This stream will appear in

Scream!'s main window when Scream! first receives some data from it.

Every stream is identified by a 6-character code, where the first four
characters identify the digitizer, and the last two characters identify

the individual stream. The first four characters are set by default to the
serial number of the digitizer; you can change this on the System ID

pane (see above) or from the digitizer's console.

Using the example above, there are three data streams, Z, N and E,
which each output data at 20 samples/s (continuously) and 200

samples/s (occasionally).

Issue N