Cleverscope CS300 Reference Manual v2.11
Page 74 www.cleverscope.com ©Cleverscope 2004-2015
11.3 Eye-diagram Plots
The eye-diagram is a useful way of verifying that a logic signal has sufficient logic level margin to operate
reliably. It is also useful to checking the performance of FM discriminators, data slicers, and threshold detectors.
Example logic level eye-diagram:
The graph shows a history of the logic level
switching. We can see clear areas in each set of logic
transitions (the eye), which indicates that this system
will be reliable. Because the threshold level was set to
1V, and the duty cycle of the signal was not 50%,
there is some variation in position between low going
signals and high going signals: - this is a useful tool
to check out duty cycle as well.
Note that if you change the amplitude axis, the
bitmap will be left as it was, providing a way to
compare the history with another channel. If you
change the time axis, we clear the bitmap, but not
the most recent 50 plots, which will scale properly.
11.4 Performance
The persistence system uses considerable processor resources, especially when using infinite persistence. You
may see an increase in CPU usage. The rate at which acquisitions are made will be automatically throttled to
limit the maximum CPU usage when persistence is on, especially when several graphs are using it.
11.5 Conclusion
Future Improvements
You can be sure that in the future, Cleverscope will add more functions to the persistence system. Some of the
functions we’ll be thinking about are saving and restoring references or history, moving the reference signal
independent of the graph axis, and allowing Maths channels C and D to be displayed as well. Please make any
suggestions you think will improve Cleverscope.
Stored References
While we are planning for the capability to store reference signals, you are able to do so now by saving the required
reference signal in a setup file.
Click File then Save As. When opened, select Addref before triggering and the saved signal will be shown as a
reference once triggering starts.
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