RIGOL  Chapter 6 Operations and Measurements 
6-30  MSO4000/DS4000 User’s Guide 
To Set the Threshold 
 
The threshold setting is used to set the threshold upper limit, middle value and lower 
limit (expressed as the percentages of the vertical amplitude) when performing auto 
measurement on the analog channels. Modifing the threshold values will affect the 
measurement results of all the time, delay and phase parameters.  
 
Press Measure  Setting  Type, turn the multi-function knob   to select 
“Threshold” and press the knob. You can also press Type continuously to switch to 
“Threshold”. 
  Press Max and turn the multi-function knob   to set the threshold upper limit. 
The range available is from 7% to 95%. The default is 90%.  
The upper limit should be at least 1% greater than the middle value. When you 
reduce the upper limit to the current middle value, the middle value (the lower 
limit might also be included) will automatically reduce to keep it lower than the 
upper limit.  
 
  Press Mid and turn the multi-function knob   to set the threshold middle 
value. The range available is from 6% to 94% and the default is 50%.  
The actual range of the middle value is related to the current upper limit and 
lower limit and is from (the current lower limit+1%) to (the current upper 
limit-1%). 
 
  Press Min and turn the multi-function knob   to set the threshold lower limit. 
The range available is from 5% to 93% and the default is 10%.  
The lower limit should be at least 1% lower than the middle value. When you 
increase the lower limit to the current middle value, the middle value (the upper 
limit might also be included) will automatically increase to keep it higher than 
the lower limit.  
 
 
 
 
 
 
 
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