90
Figure 9-4 20MHz Sine Wave Variable Persistence 500ms
2) Erase persistence
To erase the previously acquired results from the display, tap key or adjust the horizontal time base
and vertical sensitivity. The oscilloscope will erase the persistence display and start the cumulative
acquisition again.
9.4 Horizontal Expansion Center
Horizontal expansion is divided into two types: screen center and trigger position:
1) Screen center
Select to adjust the time base waveform to expand or contract toward both sides with the screen
center as the base point, and the delay time does not change.
2) Trigger position
Select to adjust the time base waveform to expand or contract toward both sides with the trigger
position as the base point. The delay time varies with the horizontal time base.
9.5 Time Base Mode Selection
For details, please refer to “3.4 ROLL, XY“ in Chapter 4.
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