To Set up the Horizontal System   
The oscilloscope shows the time per division in the scale readout. With the horizontal 
control buttons and knobs, you can change the horizontal time base and trigger 
offset which indicates the horizontal location of trigger in the memory. 
The horizontal controls change the horizontal scale and position of waveforms. The 
horizontal center of the screen is the time reference for waveforms. Changing the 
horizontal scale causes the waveform to be expanded or compressed with respect to 
the screen center. 
Horizontal position changes the displayed waveform position, relative to the trigger 
point. 
 
The Horizontal Knobs   
: The horizontal    knob adjusts the horizontal position of 
all channel (including Math) waveforms. The resolution of this control 
varies with the time base. Pressing this button clears the trigger 
offset and moves the trigger point to the horizontal center of the 
screen. 
: Use   to select the horizontal time/div (scale factor) for the 
main or the Delayed Scan time base. When Delayed Scan is enabled, it 
changes the width of the window zone by changing the Delayed Scan 
time base. 
 
Horizontal Menu. 
Press the horizontal MENU button to display the horizontal menu. The settings of this 
menu are listed in the following table.