EXFO FTB-7000 OTDR for FTB-200 v2 - Manual (Page 59)

Testing Fibers in Advanced Mode
OTDR 45
Setting Distance Range, Pulse Width, and Acquisition Time
Setting Distance Range, Pulse Width, and
Acquisition Time
The distance range, pulse width and acquisition time are set with the
controls in the Advanced main window.
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Distance: corresponds to the distance range of the fiber span to be
tested according to the selected measurement units (see Selecting the
Distance Units on page 96).
Changing the distance range alters the available settings of the pulse
width and leaves only the settings available for the specified range. You
can select either Auto or one of the predefined values.
If your OTDR model is FTB-7000D or later, youYou can customize the
available distance range values (see Customizing the Acquisition
Distance Range Values on page 98). If you select Auto, the application
will evaluate the fiber length and set the acquisition parameters
accordingly.
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Pulse: corresponds to the pulse width for the test. A longer pulse
allows you to probe further along the fiber, but results in less
resolution. A shorter pulse width provides higher resolution, but less
distance range. The available distance ranges and pulse widths
depend on your OTDR model.
Note: Not all pulse widths are compatible with all distance ranges.
You can select either Auto or one of the predefined values.
If you select Auto, the application will evaluate the fiber type and length
and set the acquisition parameters accordingly.