Chapter 6 Operations and Measurements    RIGOL 
MSO4000/DS4000 User’s Guide  6-13 
6.  Ajust the thresholds of source A and source B 
When source A or source B is set to an analog channel (CH1 to CH4), you can set 
the threshold of the corresponding source channel. When the voltage value of 
the source channel waveform is greater than the corresponding threshold, it is 
regarded as logic “1”; otherwise logic “0”. 
1)  Press Threshold A and turn the multi-function knob   to adjust the 
threshold of source A. 
Turn the knob clockwise/counterclockwise to increase/reduce the threshold 
of source A. The adjustable range is related to the current vertical scale and 
vertical position of source A. The adjustable range is from -4*Vertical Scale 
– Vertical Position to 4*Vertical Scale – Vertical Position. 
 
2)  Press Threshold B and use the same method to adjust the threshold of 
source B. 
 
Note: When source A and source B are set to the same channel, the threshold 
of the other source will change accordingly when adjusting the threshold of one 
of the sources (the two thresholds reamin the same). 
 
7.  Turn the invert on or off 
Press Invert to turn the inverted display of the math operation waveform on or 
off. 
 
8.  Define the math operation waveform label 
Press Label to open the label submenu and the label modification interface. 
Please set the math operation waveform label by referring to “
To Set the 
Channel Label”.  
 
Note: The defined label can include uppercase English letters (from A to Z), 
lowercase English letters (from a to z), numbers (from 0 to 9), underline and 
space; the length of the label cannot exceed 4 characters. 
 
 
 
 
 
 
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