Operation Manual

Testing Fibers

46 IDEAL

Monitoring Fiber in Real Time Mode

You can monitor fiber at one wavelength at a time. You can also switch

from Real time mode to Manual mode at any time.

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

Conditions for Multimode Measurements on page 49.

To monitor fiber in Real time 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).

3. Press Menu, select OTDR, and then press Select.

4. Use the left/right function arrows until you see Parameters and display

the pane (F1/F2 key).

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.