Guralp Systems Scream - Manual (Page 127)

User guide
Invalid Compression Code : A block with a compression code other
than 1, 2, or 4.
Invalid Block Duration : A block which is not a whole number of
seconds long. GCF blocks must contain a whole number of seconds of
data, calculated as number-of-samples × sample-rate.
End Sample Mismatch : A block whose final sample (reverse
integrating constant) does not equal the first sample plus all the
differences within the block.
Checksum Errors : A block whose checksum does not match the sum
of all the bytes in the block.
Data Discontinuities : Any detected gap in a stream, along with the
reason, if known. This includes reboots, clock synchronisations, and
intentional gaps in triggered channels, as well as any data lost owing
to slow or poor-quality communications links. Status streams hold no
duration information and are not checked.
By default, log files are created in the user's directory (Local Settings
under Windows), under different names according to the source of the
data:
•
local serial inputs are logged by port, in files named
comportx.log ,
•
network servers are logged by IP address, in files named
aa_bb_cc_dd.log (for the IP address aa.bb.cc.dd), and
•
file and SCSI disk replays are logged in the file replay.log .
Any events which do not relate to a particular stream are logged in the
file scream.log. If you clear the File for each data source check-box,
all events are logged to this file.
Log files can become quite large, and it is usual to limit their size. To
do this, tick Limit to… and set a value in the box. When a xxx.log
file reaches this size, it will be renamed xxx.old, and a new, empty
xxx.log file will be created. If the file xxx.old already exists, it is
overwritten.
Finally, enter the name of a directory in the text box, or click Browse…
to find a suitable directory for saving the log file(s). See the notes
about choice of a suitable directory in Section 2.3 on page 10.
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