EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 253)

Analyzing Bidirectional Traces
OTDR 239
Analyzing the Fiber on a Specific Fiber Span
3. Enter the span event location by moving marker A along the trace using
one of the following options:
³
Drag marker A to position it to the desired span event location.
³
Enter a distance value in the Position box.
³
Use the single-arrow buttons to move marker A on the trace.
³
Use one of the double-arrow buttons to move marker A from event
to event; this will designate an existing event as a span event.
Note: Each of the first three options above may lead to the creation of a new
event, except if your location corresponds to an already existing event on
the trace.
4. Select Set Span Event to set the span start or span end marker on the
appropriate event in the trace display.
The change is applied automatically.