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Reference
WFM700 Series Waveform Monitors User Manual
3-21
Manually Measuring Rise Time. Rise time measurements of the eye waveform
check the performance of sources and signal degradation by cabling. The
following procedure provides two methods for manually measuring rise time.
The first method uses variable gain to normalize the signal and the second
method uses the percentage voltage cursors.
1. Perform the steps in Setup for Eye Measurements on page 3--17.
2. Method 1 -- Use variable gain to measure rise time.
a. Use Variable Gain to resize the waveform to 10 major divisions. Position
the top and bottom of the waveform on graticule lines.
b. Position the first timing cursor at the crossing of the rising edge of the
Eye waveform and the graticule line two divisions above the bottom of
the waveform as shown in Figure 3--8.
NOTE. You can use the horizontal MAG control in the Sweep menu for greater
accuracy when adjusting the time cursors.
c. Position the second time cursor at the crossing of the rising edge of the
Eye waveform and the graticule line two divisions below the top of the
waveform as shown in Figure 3--8.
d. The Delta time readout indicates the 20 -- 80% rise time measurement.
Figure 3- 8: Timing Cursors alignment for measuring 20- 80% rise time
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