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1.  Horizontal Offset Knob:  Used  to control  the  trigger  position  against  the  screen  center.  Push  this 
button to reset the trigger point back to the screen center. 
2.SEC/DIV Knob: Used to change the horizontal time scale so as to magnify or compress the waveform 
horizontally. If the waveform acquisition is stopped (by using the  [Run/Stop] or [Single] button), the 
SEC/DIV control will expand or compress the waveform.   
2.6. Vertical System 
2.6.1. Vertical Controls 
Vertical controls can be used to display and remove waveform, adjust vertical scale and position, set 
input parameters and perform math calculations. Each channel has a separate vertical menu to set. See 
below for menu description. 
 
1. Vertical Offset Knob: Move the channel waveform up and down on the screen. In dual-window mode, 
move the waveform in both windows at the same time in a same direction. Push this knob to return 
waveform to the vertical center position on the screen. Two channels correspond to two knobs.       
2. VOLTS/DIV Knob: Control the oscilloscope to magnify or attenuate the source signal of the channel 
waveform.  The  vertical  size  of  the  display  on  the  screen  will  change  (increase  or  decrease)  to  the 
ground level.   
3. Menu (CH1, CH2): Display vertical menu options; turn on or off the display of channel waveform.   
DC passes both DC and AC components of the input signal. 
AC blocks the DC component of the input signal and attenuates signals below 10Hz. 
Ground disconnects the input signal. 
Limits  the  bandwidth  to  reduce  display  noise;  filters  the  signal  to  eliminate  noise  and  other 
unnecessary HF components.