Horizontal Control
37
6.5
Zoom
Zoom is a horizontally expanded version of the normal display. When Zoom is selected, the display divides into two
windows. The top window covers about a third of the displays. This window displays the normal time/div window. The
area of the normal display that is expanded is outlined with a box and the rest of the normal display is ghosted. The box
shows the portion of the normal sweep that is expanded in the lower half.
The bottom window covers two-thirds of the screen. This window is a magnified portion of the normal time/div window.
Use Zoom to locate and horizontally expand part of the normal window for a more detailed analysis of the waveform.
To enable the Zoom function:
•
Press the
Zoom
key or push the
Horizontal Scale Knob
.
–
Zoom can also be enabled using the touch screen. Press the
Acquire
option located on the Menu Bar. Then
press
Zoom
.
Figure 6.6
Zoom
To change the time/div for the Zoom window, turn the
Horizontal Scale Knob
. As you turn the knob, the zoomed
window time/div is highlighted in the status line above the waveform display area. The Horizontal scale knob controls
the size of the box.
The Horizontal position knob sets the left-to-right p
osition of the zoom window. Negative delay values indicate you’re
looking at a portion of the waveform before the trigger event, and positive values indicate you’re looking at the waveform
after the trigger event.
To change the time/div of the normal window, turn off Zoom by pressing the
Zoom
key ; then, turn the
Horizontal Scale
Knob
.
