EXFO OTDR 2 - Manual (Page 117)

Analyzing Traces and Events
OTDR 109
Using Zoom Controls
Using Zoom Controls
Use the zoom controls to change the scale of the trace display.
You can zoom in on or out of the graph using the corresponding buttons or
let the application automatically adjust the zoom on the currently selected
event from the events table (table only available when the events window
is displayed).
You can quickly zoom in on or out of the selected event.
You can also return to the original graph value.
Note: You cannot move the markers with the button.

When you manually zoom in or out on a trace, the application will
apply the new zoom factor and marker positions to the other traces
(wavelengths) of a same file. Both the zoom factor and marker
positions will be saved along with the trace (same settings for all
wavelengths).
Selection mode
Move view area
Zoom selector
Zoom in
Full view
Zoom out
Zoom on event