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Chapter 10 Real-time Eye Diagram and Jitter Analysis (Option) RIGOL
MSO8000 User's Guide 10-3
To Set the Threshold
I n the "Eye" setting menu, press Threshold to enter the threshold setting menu.
Set the high threshold
Press HighThres, then rotate the multifunction knob or 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.
Set the middle threshold
Press MidThres, then rotate the multifunction knob or 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.
Set the low threshold
Press LowThres, then rotate the multifunction knob or 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.
I n the "Eye" setting menu, press 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
The Press RecoveryType, then rotate the multifunction knob to select
"Constant" and press down the knob to select it. You can also press the
RecoveryType key continuously or enable the touch screen to select it.
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.
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