Rigol DHO900 Series User Manual page 152

Measurements
Negative Pulse Count
It is specified as the number of negative pulses that fall from above the threshold
upper limit to below the threshold lower limit.
Rising Edge Count
It is specified as the number of rising edges that rise from under the threshold lower
limit to above the threshold upper limit.
Falling Edge Count
It is specified as the number of falling edges that fall from above the threshold
upper limit to below the threshold lower limit.
DHO900 User Guide
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Negative Pulse Count = n
Threshold
Upper Limit
Threshold
Lower Limit
n
Rising Edge Count = n
n
Threshold
Upper Limit
Threshold
Lower Limit