EXFO FTB-700 for FTB-1 - Manual (Page 257)

Analyzing Traces with the Bidirectional Analysis Application (Optional)
OTDR 249
Setting Pass/Fail Thresholds
To revert to default threshold values and to delete custom
wavelengths:
1. From the Main Menu, select Setup, then select the Thresholds tab.
2. Press the Revert to Factory Settings button.
3. When the application prompts you, confirm the modification with Yes.
All threshold values of all wavelengths are returned to their default values,
except for thresholds that are associated with custom wavelengths.
I
MPORTANT
When you revert thresholds to their default values, custom
wavelengths will be deleted from the list of available wavelengths,
except if a file using at least one of these wavelengths is still open.