Front-Panel Controls 2
6000 Series Oscilloscope User’s Guide 93
To change the sweep speed for the Zoom sweep window, turn
the sweep speed knob. As you turn the knob, the sweep speed is
highlighted in the status line above the waveform display area.
The time reference position sets the initial position of the
trigger event within acquisition memory and on the display,
with delay (horizontal position) set to 0. The delay setting sets
the specific location of the trigger event with respect to the time
reference position. The time reference setting affects the Zoom
sweep in the following ways.
When the horizontal mode is set to Main, the horizontal position
knob positions the main sweep relative to the trigger. This delay
is a fixed number. Changing this delay value does not affect the
sweep speed. When the horizontal mode is set to Zoom, the
delay controls the position of the Zoom sweep window inside
the main sweep display. This delay value is independent of
sampling interval and sweep speed.
To change the sweep speed for the main sweep window, press
the Main softkey, then turn the sweep speed knob.
For information about using Zoom mode for measurements,
refer to Chapter 5, “Making Measurements,” starting on page
207.
Roll mode
Press the Menu/Zoom key, then press the Roll softkey.
Roll mode causes the waveform to move slowly across the
screen from right to left. It only operates on time base
settings of 500 ms/div and slower. If the current time base
setting is faster than the 500 ms/div limit, it will be set to
500 ms/div when Roll mode is entered.
In Normal horizontal mode, signal events occurring before
the trigger are plotted to the left of the trigger point (t) and
signal events after the trigger plotted to the right of the
trigger point.