Guralp Systems CMG-5TD User Manual
Page 19
Operation
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Z2, N2, E2 are input channels Z, N, E output through the second tap ‘2’;
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Z4, N4, E4 are input channels Z, N, E output through the third tap ‘4’,
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Z6, N6, E6 are input channels Z, N, E output through the fourth tap ‘6’,
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00 is the digitiser status stream (notice that there is no sample rate)
(Odd tap numbers (1, 3, 5, …) are used for streams from a second instrument.)
For each tap there are two rows of check-boxes where the user can tick either
triggered or continuous data outputs. The digitiser applies a simple short
term average (STA)
÷ long term average (LTA) algorithm and/or an absolute
level (counts) algorithm to a selected stream or set of streams to determine
whether the trigger condition is met. These streams may be bandpass filtered
before evaluation using standard bandpass parameters. The data transmitted
due to the trigger may be from different streams than those used to determine
the trigger.
For this to function properly, triggering streams must be selected and trigger
criteria must be set by clicking on the Trigger button . When at least one
stream is selected for triggered output, selection of triggering streams and
trigger criteria are enabled. It is possible to trigger from one tap but record
data from one or several different taps.
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Issue D - April 2013