Thank you for your post.
Unfortunatly you cannot plot the 'Duty Cycle' as a graph.
You can have it as a measurement by adding one using the following Steps:-
Select the add measurement by clicking on the following Tabs:
Measurements > Add Measurement >
In the Dialog box that opens select the channel you wish to measure off on the first drop down menu.
Then on the second drop down menu select the 'Duty Cycle' option.
On the Third drop down menu select the 'Whole Trace' option.
This will give you a measurement of the duty cycle on the bottom of the screen. You can then run the Test over the Number of Pages 'Buffers' till you have completed the test then scroll over the previous pages monitoring the measurement table to see how the Duty Cycle Changed.
I hope this helps to answer your question.
Lee - Automotive Technical Specialist