Exfo FTB-7000 OTDR for FTB-200 v2 Instrukcja Użytkownika Pobierz pdf (Strona 285)

100

101

Maintenance

OTDR 271

Verif ying Your OTDR

To evaluate the launch level:

1. Connect at least 2 km of fiber to the OTDR port.

³ Ensure that the OTDR port and connectors are properly cleaned

and that the fiber settings are accurate (IOR, Helix factor and RBS).

³ Do not use a test jumper between the OTDR and the fiber under

test to limit the number of connectors.

2. Set the distance range to the fiber length used for the evaluation, the

pulse width to the shortest value available, and the acquisition time to

15 seconds.

3. Evaluate the launch level at 0 km by extrapolating the linear region of

the curve.

The launch level should be located within the launch window (light green

rectangle) appearing on the left side of the Y-axis on the graph. If the

launch level is below this window, clean the output connector again, retest

the fiber and change the output connector if necessary. If the situation

persists, you will observe a degradation in dynamic range. Return the

OTDR to EXFO.

Note: This does not affect the precision of distance or loss measurements.

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