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Chapter 10 Real-time Eye Diagram and Jitter Analysis (Option) RIGOL
DS8000-R User's Guide 10-3
âš« Set the high threshold
Click HighThres, then use the pop-up numeric keypad to set the high
threshold.
Note: If you reduce the high threshold to a value below the set middle
threshold, the oscilloscope will automatically adjust the high threshold to
make it greater than the middle threshold.
âš« Set the middle threshold
Click MidThres, then use the pop-up numeric keypad to set the middle
threshold.
Note: The middle threshold is limited by the set low threshold and high
threshold.
âš« Set the low threshold
Click LowThres, then use the pop-up numeric keypad to set the low threshold.
Note: If you increase the low threshold to a value above the set middle
threshold, the oscilloscope will automatically adjust the low threshold to
make it smaller than the middle threshold.
To Set Clock Recovery
The clock recovery provides an ideal clock for comparison to actual signal edges.
In the "Eye" setting menu, click Clock Recovery to enter the clock recovery menu.
This oscilloscope supports several clock recovery methods, including constant clock,
phase-locked loop (PLL), and external clock.
1. Setting method for constant clock recovery
Click RecoveryType to select "Constant".
âš« Set the data rate type
The data rate type for Constant includes Manual, Semi-auto, and Auto.
➢ Manual: recovers the clock by the data rate input manually.
➢ Semi-auto: recovers the clock by the manually preset data rate and the
signal edge.
➢ Auto: recovers the clock based on the narrowest pulse of the signal.
Click Type to select the desired data rate type.
âš« Set the data rate
Click Data Rate, then use the pop-up numeric keypad to set the data rate.
Note: When the data rate type is set to Auto, the Data Rate menu is
grayed out and disabled, and only the automatically recovered frequency of
the ideal clock can be displayed.
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