Guralp-systems Scream Manual do Utilizador descarregar pdf (Página 80)

Scream! 4.5

With this configuration uploaded, Tap 3 will continue to produce

output at all times, but Tap 2 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.

Every ticked box in this window will give rise to a data stream coming

from the digitiser, which will be displayed in Scream!'s main window

when Scream! first receives some data from it.

7.3 Triggering

In its standard configuration, the digitiser outputs continuous data at a

sample rate you specify. In addition to this, Güralp digitisers can run

a triggering algorithm on the data they acquire. This allows you to

record data continuously at a relatively low sample rate, but record at

a much higher sample rate during short periods when the trigger is

active. The parameters controlling the triggering algorithm, and

controlling the data output once the system is triggered, are all

selectable by the user, permitting maximum flexibility of operation

and the most efficient use of available storage space.

The digitiser can be set up for triggered output, that is, to generate

certain data streams only when a particular trigger criterion is met.

The trigger criterion can be tested with data from the same or some

other stream. For example, you could use a later tap (with a lower

sample rate) as a trigger for output from an earlier, more detailed tap.

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Guralp-systems Scream Manual do Utilizador Página 80