Agilent Technologies 8719ES User Manual page 265

How the Analyzer Names These Files Sequentially
When text files are saved, the analyzer generates the file names automatically in the
following format:
txtcss.csv
where: txt is a constant that indicates that this is a text file,
c is the indicator of the channel (1−4) on which the measurement data was
taken.
ss is a 2-digit, sequential indicator of the measurement (file index number). The
file index number may be numbered from 00−31. As the next measurement is
taken, the file index number is incremented.
If all four channels are making measurements and a save is performed, there
will be four channel numbers that share the same file index number. For
example, the files would be named txt100.csv, txt200.csv, txt300.csv, and
txt400.csv. If a measurement does not include all four channels, unused
channel-file index numbers will not be used by the next measurement.
However, if all of the files that share a file index number are erased, that file
index number will be re-used.
csv is the file format, comma-separated value in this case.
Printing, Plotting, and Saving Measurement Results
Saving Measurement Results
4- 45