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If you select Single Zoom, a control panel for these functions appears when you touch any point in the
main window:
 Set Voltage/Division (Vertical Scale knob): Tap the upper left field of the displayed Single Zoom menu
to change the Volt/Div of CH1 (yellow) or the lower left field to decrease it. For CH2, perform this operation
in the right fields.
 Change the horizontal time base (Horizontal Scale knob): Use the left field of the displayed Single
Zoom menu (S) to increase the time base and the right field (nS) to decrease this value.