Guralp Systems Scream - Manual (Page 72)

Scream! 4.5
6.3.3 Age
This column records the time the instrument last sent data to Scream!.
When a data block is received, the box turns green. Over the next two
minutes, if no more data are received, the box gradually changes
through shades of yellow, to orange, and finally red.
If more than two minutes pass before the next data block is received,
the border of the box will change to red to alert you that a suspicious
gap in data has been detected. If you do not expect real-time data from
this instrument, or you are using low sample rates exclusively, you
may allow this column to turn red. For example, a 1 sample per
second stream will transmit a block only once every four minutes
under quiet conditions.
Double-click on a column entry to select the instrument in Scream!'s
main window.
6.3.4 Errors
This column records the number of corrupted blocks Scream! has
received. A corrupted block is one whose checksum does not match
the data, or which fails one of Scream!'s integrity checks. To see
which checks are failing:
•
Open a ViewInfo window on the suspect stream, where
erroneous values are shown in red (see Section 1.1.4 on page
74).
•
Alternatively, double-click on the column entry to open the error
log file (if you are recording one) in Notepad or an xterm.
The meaning of the colours is as follows:
Green : Fewer than two corrupted data blocks have been received in
the last minute, or the window was reset less than a minute ago.
Yellow : between two and ten corrupted data blocks have been received
in the last minute.
Red : More than ten corrupted data blocks have been received in the
last minute.
6.3.5 Triggers
This column records the number of times the digitiser has sent a
trigger status message since Scream! was started. New triggers are
72 Issue K