EXFO FTB-700 for FTB-1 - Manual (Page 103)

Customizing Your OTDR
OTDR 95
Customizing the Acquisition Distance Range Values
Customizing the Acquisition Distance Range
Values
Note: This function is available in Advanced mode only.
You can customize the values associated with the Distance dial. Once the
customization is complete, you are ready to set the distance range value
for your test. For more information, see Setting Distance Range, Pulse
Width, and Acquisition Time on page 43.
Note: The Auto value cannot be modified.