EXFO OTDR 2 - Manual (Page 164)

Using the OTDR as a Light Source
156 OTDR
To use your OTDR as a source:
1. Clean the connectors properly (see Cleaning and Connecting Optical
Fibers on page 16).
2. Connect one end of the fiber under test to the OTDR port.
If your unit is equipped with two OTDR ports, ensure that you connect
the fiber to the appropriate port (singlemode, singlemode live, or
multimode), depending on the wavelength you intend to use.
3. From the main window, tap the Source tab.
4. Select the wavelength you want to use.
Note: If only one wavelength is available, it is selected by default.