RIGOL Chapter 10 Real-time Eye Diagram and Jitter Analysis (Option)
10-4 DS8000-R User Guide
2. Setting method for phase-locked loop (PLL)
Click RecoveryType to select "PLL".
âš« Set the data rate
Click Data Rate, then use the pop-up numeric keypad to set the data rate.
âš« Set the PLL order
This oscilloscope supports first-order PLL and second-order PLL. Click PLL
Order to select the order number.
âš« Set the loop BW
Click Loop BW, then use the pop-up numeric keypad to set the loop
bandwidth.
âš« Set the damping factor
When PLL order is set to "2nd Order", you need to set the damping factor. It
is the damping factor of the PLL's observed jitter transfer function (OJTF).
Click DampFactor, then use the pop-up numeric keypad to set the
damping factor.
The typical damping factor is 1.0 and 0.707. The former is critically damped,
and the latter is the ideal or optimal value.
3. Setting method for external clock recovery
Click RecoveryType to select "Explicit".
Click Source to select the desired source. The analog channel (CH1-CH4) can
be selected as the source of the external clock.
To Enable or Disable the Eye Measurement Result
In the "Eye" setting menu, click the Result key continuously to enable or disable the
eye measurement result. When it is enabled, the statistical results of the eye
measurement item data will be displayed at the upper-left corner of the screen, as
shown in the following figure. You can drag the statistical results with the mouse to
any place where you want to put it for view on the screen.
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