EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 201)

Analyzing the Results Manually
OTDR 187
Using Markers
Using Markers
You can use markers to view the position and relative power of an event.
Markers are available when you press Measure from the main window, as
well as in the Change and Insert windows, accessible from the Event pane.
To move a marker:
1. Press the button corresponding to the marker you want to move.
2. Once the appropriate marker is selected, use the right and left arrow
buttons to move the marker along the trace.
Note: You can also select the marker directly on the trace display and drag it to
the desired position.
If a marker is moved closed to another one, both will move together. This
ensures a minimum distance is maintained between markers.
A marker may disappear from the trace after you zoom in (see Using Zoom
Controls on page 137). You can recall it by selecting the button
corresponding to the missing marker and by using one of the arrows to
bring the selected marker back into the displayed area.
Power at A
Distance between
span start and B
Power at B
Distance between A
and B
Power difference
between A andB
Distance between
span start and A