EXFO FTB-7000 OTDR for FTB-200 v2 - Manual (Page 237)

Analyzing Traces with the Bidirectional Analysis Application
OTDR 223
Using Zoom Controls
To view specific portions of the graph:
³
You can define which portion of the graph will be visible by selecting
the
button and dragging the graph with the stylus or your finger.
This could be useful, for example, if you want to zoom in on events
located outside the defined fiber span.
³
The button is the zoom selector. It allows you to select whether
the zooming will be performed according to the horizontal axis, the
vertical axis, or both.
Press and hold this button to select the zooming direction in the menu.
Then, define the zoom area with the stylus or your finger (a rectangle
with dotted lines will appear to help you define the area). Once you
release the stylus, the application automatically zooms in on the graph
according to the zooming type you have selected.. All of the other
zoom buttons (except for the zoom on selected event button) will
reflect your selection and behave accordingly.
³
You can zoom in or out on the graph by first using, respectively,
the or the button, and then by pressing the location where
you want to zoom on the graph with the stylus or your finger.
The application automatically adjusts the zoom by a factor 2 around
the point that was pressed.