Guralp Systems CMG-DM24 - Manual (Page 22)

CMG-DM24
extract by checking or un-checking the check box beside each
stream.
You can check or un-check all of the boxes using the Select
all and Unselect all buttons. Clicking Invert checks all
unchecked boxes, and un-checks all checked boxes.
4. Enter a path name into the Target Directory field, or use the
Browse... button to find a directory. This will be used as the
root directory for extracted data. If it does not exist, gcfxtract
will create it.
5. Enter a format string into the Filename Format field. The
syntax is the same as the format string in Scream! and full
documentation is available by pressing the '?' button beside
the format entry field in interactive mode.
6. Normally, gcfxtract outputs GCF files, to ensure all the
information in the original data is retained. If you want to
convert to a different format, select it from the Output Data
Format drop-down box. gcfxtract can output in most of the
formats supported by Scream!.
7. Data is automatically placed in time order and saved in
multiple files, each file containing a contiguous segment of
data. By default, data streams are recorded in files 60 minutes
long. To change this to some other number of minutes, alter
the value in the Data File Duration (mins) box.
For data streams, if there is a gap in the data, gcfxtract will
start a new file anyway.
Status streams are also saved in in multiple files, but have a
default length of 24 hours. To change this, alter the value
under Status File Duration (hours).
8. When you are happy with the settings, click Extract to begin
extracting the data.
9. Clicking Reset sets a flag on the disk which marks it as
empty. Next time a digitizer wants to transfer data, it will
begin at the beginning of the disk, overwriting the old data.
When this happens, none of the old data can be extracted
with gcfxtract or Scream!. Until then, however, you will still
be able to retrieve all the data.
22 Issue N