Operation Manual

Testing Fibers

OTDR 41

Testing in Fault Finder Mode

Note: This function is available only with the optional FTTx software package.

The application offers you a special testing feature to rapidly locate fiber

ends. It also displays the length of the fiber under test.

The unit will determine the more appropriate wavelength (singlemode or

multimode, depending on your test configuration). Duration of the

acquisition is 45 seconds.

If you intend to test at multimode wavelengths, carefully read Launch

Conditions for Multimode Measurements on page 49.

To acquire traces in Fault finder mode:

1. Clean the connectors properly (see Cleaning and Connecting Optical

Fibers on page 22).

2. Connect a launch fiber between the device under test and the OTDR

port. If necessary, set the launch fiber length (see Setting Analysis

Parameters on page 28).

If your unit is equipped with two OTDR ports, ensure that you connect

the fiber to the appropriate port (OTDR SM, OTDR MM, or

OTDR SM Live for filtered wavelength).

CAUTION

Never connect a live fiber to the OTDR SM or OTDR MM port. Any

incoming signal greater than –40 dBm will affect the OTDR

acquisition. Any incoming signal greater than –20 dBm could

damage your OTDR permanently.