Hantek 6022BE    
The Trigger System
The following figure shows the trigger system control. 
Mode: Sets the trigger mode to Edge trigger
 
Sweep: Selects the trigger sweep mode to AUTO, NORMAL or SINGLE
 
Source: Selects the trigger source to CH1, CH2, ALT, EXT or EXT/10
 
Slope: Selects the edge trigger slope to Positive or Negative slope
 
The user can drag the trigger icon to adjust the trigger level and the trigger 
level will be displayed on the top right corner.
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The User’s Manual