EXFO OTDR 2 - Manual (Page 27)

Preparing Your OTDR for a Test
OTDR 19
Naming Trace Files Automatically
You can select the number of digits displayed for the incremented or
decremented values.
Select "#" if you want to keep the value exactly in the same format as
defined in the start and stop values. If a value is to be incremented from 1
to 10, it becomes 1, 2, 3, ... 9, 10. One "#" is the default format.
Select two, three, or four "#" if you want all values to be expressed with the
same number of digits. The application fills the empty spaces with zeros
before the increment or decrement to ensure the appropriate format is
displayed. For example, if you select two "#" and the value is to be
incremented from 1 to 10, it becomes 01, 02, 03, ... 09, 10.
Note: If you choose not to save a particular trace file, the suggested file name
remains available for the next trace you acquire.
This function is particularly useful when testing multiple-fiber cables.
If you deactivate the automatic file naming function, the application will
use the default file name, which is Unnamed.trc.
By default, traces are saved in native (.trc) format, but you can configure
your unit to save them in Bellcore (.sor) format (see Selecting the Default
File Format on page 79).
Note: If you select the Bellcore (.sor) format, the unit creates one file per
wavelength (for example, TRACE001_1310.sor and TRACE001_1550.sor, if
you included both 1310 nm and 1550 nm in your test). The native (.trc)
format contains all wavelengths in a single file.
The autonaming parameters can be set only for files that have not been
saved yet. You will only see the parameters for the current and next
acquisition (when the test is done but not saved yet), or for the next
acquisition only (test is not done yet). Otherwise, the parameters will not
be displayed.
It is also possible to revert the settings to their default values.