200 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
14 Measurements
Fall Time
The fall time of a signal is the time difference between the crossing of the upper
threshold and the crossing of the lower threshold for a negative-going edge. The X
marker shows the edge being measured. For maximum measurement accuracy,
set the horizontal time/div as fast as possible while leaving the complete falling
edge of the waveform on the display. The Y markers show the lower and upper
threshold points.
Time at Edge
Time at Edge measures the horizontal time of the edge location specified by the
Source, Slope, and Edge # parameters.
The threshold voltage used for this measurement is the 50% point with a small
amount of hysteresis added. (The "middle" measurement threshold setting for the
source waveform does not affect this measurement.)
When the specified slope and edge number threshold crossing is found, the
oscilloscope reports the time of that crossing in seconds, with the trigger point
(time=zero) as the reference.
If the specified crossing cannot be found, that is, if the waveform does not cross
the 50% vertical value, or if the waveform does not cross the 50% vertical value for
the specific number of times at the slope specified, the oscilloscope reports "No
edges".
When Auto is selected as the Edge #, the edge closest to the timebase reference
point is used. When you specify an edge number, edges are counted from the left
side of the display.
FFT (Fast Fourier Transform) waveforms cannot be selected as the source.
Delay
Delay measures the time difference between two waveform edges using the
specified threshold points of the waveforms.
Negative delay values indicate that the selected edge of source 1 occurred after
the selected edge of source 2.
1 From the menu, choose Measure > Measurements....
2 In the Measurements dialog box, select the Add, Edit & Delete tab.
3 From the Type list, select the Delay measurement.
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