EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 152)

Analyzing Traces and Events
138 OTDR
Using Zoom Controls
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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 and on the reference file, if applicable.
Both the zoom factor and marker positions will be saved along with the
trace (same settings for all wavelengths).
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When you zoom in or out on the selected event, the application keeps
the zoom on this event until you select another event or change zoom
or marker positions (via the Measure tab). You can select a different
event for each wavelength (for example, event 2 at 1310 nm and
event 5 at 1550 nm). The selected events will be saved along with the
trace.
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You can also apply the zoom factor and marker positions of the current
trace to all the trace files that are currently open. However, these files
will be treated exactly as if you manually zoomed in or out on the
traces.
To view specific portions of the graph:
1. On the trace display, drag the magnifying glass icon to the area where
you want to adjust the zoom.
2. Select the desired type of zoom.
3. Press the button corresponding to the desired behavior as many times
as needed.
Zoom along vertical axis only
Zoom along horizontal axis only Zoom along both axes
Zoom in Zoom out