To Apply the Vertical Knobs   
Use the vertical controls to display signal waveforms by adjusting the vertical 
  knob, and the    knob, and setting the input parameters. 
 
1.  Using vertical 
 knob. 
The vertical 
 control  changes  the  vertical position of signal 
waveforms in all channels (excluding MATH and REF). The resolution changes 
according to the vertical level set. Pressing this knob will clear the channel’s 
vertical offset to zero.   
 
2.  Using vertical 
 knob. 
The vertical
 control  changes  the  vertical  sensitivity  of  signal 
waveforms in all channels (excluding MATH and REF). If the Volts/Div is set to 
“Coarse”, the waveform scales in a 1-2-5 step sequence from 2 
mV ,5mv,10mv…to 10 V. If the Volts/Div is set to “Fine”, it scales to small steps 
between the coarse settings. Turn the knob clockwise to decrease the vertical 
scale, turn the knob counter-clockwise to increase the vertical Volts/Div setting. 
You can toggle between “coarse” and “Fine” setting through pressing the 
 knob. 
 
3.  Channels(excluding Math and REF ˅ would be adjustable by the 
vertical
and only when they are selected. 
 
4.  During the vertical positioning, a position message is displayed on the left 
bottom of the screen, in the same color along with the corresponding channel. 
The unit is V (Volts).