Keysight DSOX3034T - To adjust the horizontal (time;div) scale

64 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
2 Horizontal Controls
The Horizontal Menu lets you select the time mode (Normal, XY, or Roll), enable
Zoom, set the time base fine control (vernier), and specify the time reference.
The current sample rate is displayed in the Summary box in the right-side
information area.
To adjust the horizontal (time/div) scale
1 Turn the large horizontal scale (sweep speed) knob marked to
change the horizontal time/div setting.
Figure 2 Horizontal Menu
Trigger
point
Sample rate
Time
reference
Delay
time
Time/
div
Trigger
source
Trigger level
or threshold
XY or Roll
mode
Normal
time mode
Zoomed
time base
Fine
control
Time
reference