User Manual

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Figure 21 – Zoom function
The area of the normal display that is expanded is outlined with a dark box and the rest of the
normal display is gray. The darker area shows the portion of the normal sweep that is expanded
in the lower half of the screen.
To change the time base for the Zoom window, turn the Horizontal Scale knob. The Horizontal
Scale knob controls the size of the darker zoom window on the upper waveform. The Horizontal
Position knob sets the position of the zoom window. Negative delay values indicate that a portion
of the waveform before the trigger event is displayed, and positive values indicate a portion of
the waveform after the trigger event.
If the zoomed time/div (prefaced with Z at the top of the screen) is substantially smaller than the
main time/div, you may see significant jitter on things like the edges of fast-rising pulses. You can
get a stable display for making measurements by pressing the Single trigger button. Turn
persistence on to measure jitter.
To change the zoomed time base of the normal window, turn off the Zoom function and adjust
the Horizontal Scale knob.
Normal time
Zoomed time base