Chapter 2 Vertical System Setting    RIGOL 
MSO4000/DS4000 User’s Guide  2-5 
To Specify the Channel Coupling 
 
Set the coupling mode to filter out the undesired signals. For example, the signal 
under test is a square waveform with DC offset. 
  When the coupling mode is “DC”, the DC and AC components of the signal under 
test can both pass the channel. 
  When the coupling mode is “AC”, the DC components of the signal under test are 
blocked. 
  When the coupling mode is “GND”, the DC and AC components of the signal 
under test are both blocked. 
 
Press CH1  Coupling and turn the multi-function knob   to select the desired 
coupling mode (the default is DC). You can also press Coupling continuously to 
switch the current coupling mode. When different coupling mode is selected, 
different coupling label is displayed in the channel status label at the bottom of the 
screen, as shown in the figure below. When “AC” coupling mode is selected, the 
character “AC” below CH1 is illuminated.  
     
DC       AC      GND 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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