EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 71)

OTDR 57
5 Testing Fibers in Auto Mode
Auto mode automatically evaluates fiber length, sets acquisition
parameters, acquires traces, and displays event tables and acquired traces.
You can select an option that will allow you to modify fiber settings (IOR
also known as group index, RBS coefficient, and helix factor) or analysis
detection thresholds (splice loss, reflectance, and end-of-fiber detection)
once the test is complete. For more information, see Viewing and
Modifying Current Trace Settings on page 153.
You can also configure the application so that it will always start in Auto
mode directly.
In Auto mode, you can only set the following parameters directly:
³
Test wavelengths (all selected by default)
³
Fiber type (singlemode, singlemode live, or multimode) for models
supporting these fiber types
For all other parameters, the application uses those defined in Advanced
mode, except that analysis is always performed after acquisitions.
If you ever need to modify other parameters, go to Advanced mode (see
Testing Fibers in Advanced Mode on page 63 and Setting Up Your OTDR on
page 25).
In Auto mode, the application will automatically evaluate the best settings
according to the fiber link currently connected to the unit (in less than
5 seconds). If you interrupt it, no data will be displayed.
Fiber characteristics are evaluated only once per session. Other fibers you
connect to, within the same cable, will be tested with the same settings.
When you start testing another link, you can reset these parameters.
Once this evaluation is complete, the application starts acquiring the trace.
The trace display is continually updated.
Note: You can interrupt the acquisition at any time. The application will display
the information acquired to that point.