Chapter 7 Logic Analyzer    RIGOL 
MSO4000/DS4000 User’s Guide  7-7 
reset the threshold level of channels D15 to D8 to 0 V). The adjustable 
range is from -20.0 V to +20.0 V. 
 
Note: The threshold levels of channels D7 to D0 and channels D15 to D8 are 
independent. The current threshold levels are displayed in D7-D0 and D15-D8 
respectively.   
 
In addition, when the trigger source is set to a digital channel (D0 to D15), adjusting 
the trigger threshold level (turn TRIGGER 
  LEVEL) will modify the 
corresponding threshold level setting here at the same time.  
 
 
To Use the Digital Bus 
 
MSO4000/DS4000 provides two digital buses (BUS1 and BUS2). You can display the 
channel group D7 to D0, D15 to D8 or D15 to D0 as a bus. The bus data will be 
displayed at the bottom of the screen in data or graph mode. BUS1 and BUS2 can be 
turned on at the same time.  
 
Press LA  Bus to enter the digital bus setting menu. As the setting methods of 
BUS1 and BUS2 are the same, BUS1 is taken as an example to illustrate the setting 
method.  
 
In the digital bus setting menu, 
1.  Select BUS1 
Press Bus to select “BUS1”. 
 
2.  Turn BUS1 on or off 
Press BusStatus to turn BUS1 on or off. When BUS1 is turned on, the bus data 
will be displayed at the bottom of the screen according to the current setting.  
 
3.  Specify the digital channel corresponding to BUS1 
Press Sel CH; turn the multi-function knob   to select the desired digital 
channel and press the knob. You can also press Sel CH continuously to switch 
the digital channel currently selected. D7 to D0, D15 to D8 and D15 to D0 can be 
selected.  
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