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CMG-DCM
low a value will result in spurious non-seismic noise triggering the system. Like
the averages, their ratio is continuously recalculated for all components. Note
that none of the boxes are allowed to be empty, and so you will need to enter the
new value before removing the old one. Alternatively, you can use the up and
down cursor keys to change the values.
For example, setting the STA to 1 second, the LTA to 10 seconds and the Ratio
to 4 would give rise to the following trigger behaviour:
Usually, the values of the STA and LTA periods, and of the Ratio, will be the
same for all checked channels. For convenience, Scream! will automatically fill
in other values to match ones you enter. If you want to use different values for
72 Issue A