To Zoom On A Section Of The Waveform - Keysight Technologies Infiniium 90000A Series User's Quick Start Manual

To zoom on a section of the waveform

1 Click and hold the left mouse button or touch screen stylus in a blank
space within the waveform display area, then drag the pointer to draw
a rectangle around the areas of interest on the waveform(s) then
release.
2 Click on the Waveform Zoom menu item.
How the zoom takes place depends on whether acquisition is running or
stopped. If running, the oscilloscope adjusts vertical scale, vertical offset,
horizontal scale, and horizontal position as necessary to best rescale the area
you defined in step 1. If stopped, the oscilloscope does a software magnification
of the waveform.
In either case, a small dialog box appears in the corner of the screen, with an
"Undo" button; by clicking this button, you will undo the zoom and return the
oscilloscope to its previous settings.
Avoid Overdriving the Vertical Input Amplifiers
When the oscilloscope is running, the input waveform can overdrive the vertical
input amplifiers if you expand the vertical excessively. The result is distortion of
the waveform. Ensure that you select a region that will keep all of the waveform
on the screen vertically.
Using the Oscilloscope
To zoom on a section of the waveform
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