Chapter 6 Operations and Measurements    RIGOL 
MSO4000/DS4000 User’s Guide  6-9 
Digital Filter 
 
MSO4000/DS4000 provides 4 types of digital filters (Low Pass Filter, High Pass Filter, 
Band Pass Filter and Band Reject Filter). The frequencies within the specified 
waveform segment of the signal can be filtered by setting the range of bandwidth.  
 
1.  Select digital filter 
Press MATH  Operate; turn the multifunction knob   to select “Digital 
filter” and press the knob. You can also press Operate continuously to switch to 
"Digital filter".   
 
2.  Select the filter type 
Press Filter Type; turn the multifunction knob   to select the desired filter 
type and press the knob. You can also press Filter Type continuously to switch 
the filter type currently selected. 
  : low pass, namely only the signals whose frequencies are lower 
than the current Upper Limit can pass the filter. 
  : high pass, namely only the signals whose frequencies are greater 
than the current Lower Limit can pass the filter. 
  : band pass, namely only the signals whose frequencies are greater 
than the current Lower Limit and lower than the current Upper Limit can 
pass the filter.  
  : band reject, namely only the signals whose frequencies are lower 
than the current Lower Limit or greater than the current Upper Limit can 
pass the filter.  
 
3.  Select the source 
Press Source; turn the multifunction knob   to select the desired channel and 
press the knob. You can also press Source continuously to switch the channel 
currently selected. You can select CH1, CH2, CH3 or CH4.  
 
4.  Set the bandwidth 
When “low pass” filter type is selected, you only need to set the frequency upper 
limit; when “high pass” filter type is selected, you only need to set the frequency 
lower limit; when “band pass” or “band reject” filter type is selected, you need 
to set both the frequency upper limit and lower limit. 
 
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