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Chapter 2: Probing and Selecting the Sampling Mode
Choosing the Sampling Mode
6. In the Sampling Positions dialog, select the Eye Finder option.
7. In the Eye Finder Setup tab, select the Use signals from Device Under
Test option.
The Use demo data (no probes required) option is for demonstration
purposes only.
8. Choose the labels that you wish to run eye finder on.
You may want to run eye finder on channel subsets, for example, when
certain bus signals transition in one operating mode (of the device under
test) and other bus signals transition in a different operating mode.
9. Select the Run Eye Finder button.
For more information on run messages, see “Eye Finder Run Messages” on
page 162.
When eye finder finds more than one stable region on a channel, it uses
the current sampling position as a hint about which stable region it should
suggest a position for.
If eye finder picks the wrong stable region, you can expand the label and
drag the blue Sampling Position line into the correct stable region. The
suggested sampling position for that region will be shown (see “How
Selected/Suggested Positions Behave” on page 161).
10. If you have moved the sampling position and wish to return to the
suggested positions, go to the Eye Finder Results tab, select a label button
or the Results menu, and choose the "set to suggested" command.
For more information on informational messages in the Eye Finder Results
tab, see “Eye Finder Info Messages” on page 165.
Eye finder finds optimal sampling positions for the actual specific
conditions -- amplitude, offset, slew rates, and ambient temperature.
Therefore, you will get the best results by running eye finder under
the same conditions that will be present when logic analysis
measurements are made.
To run eye finder repetitively
1. Select the Repetitive Run option in the Eye Finder Setup tab.
2. Select the Run Eye Finder (r) button.