Exfo FTB-7000 OTDR Series for FTB-500 Instrukcja Użytkownika Pobierz pdf (Strona 210)

100

101

Analyzing the Results Manually

196 OTDR

Getting Reflectance

Reflectance is the ratio of reflected light to input light.

Note: When performing reflectance measurements on recalled traces from

non-EXFO test equipment that were saved in Telcordia (Bellcore) format,

the results displayed could be less accurate than with EXFO file format.

To get reflectance:

1. From the main window, go to the Graph tab and press the Measure

button

2. In the Measurements section, press the Refl. button. Markers a, A and

B appear on the graph.

3. Zoom in and position marker A on the linear area preceding the event

to be measured. For more information, see Using Zoom Controls on

page 137 and Using Markers on page 187.

4. Position submarker a at the beginning of the linear area preceding the

event to be measured.

5. Position marker B at the peak of the reflective event to be measured.

Note: Using this procedure, you can measure the reflectance of all the events in a

merged reflective fault event.

Note: For non-reflective events, ∗∗∗∗∗ will be displayed.

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