User`s guide

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Logic Analyzer Reference
The Compare Menu
This means that when you change the current row position in the
Difference listing, the analyzer automatically updates the current row
in the acquired State listing and Reference listing, and vice-versa.
If the three listings are synchronized and you acquire data again, the
Reference listing may have a different number of pre-trigger states
depending on the trigger criteria. The Reference listing can be
resynchronized to the State and Difference listings by entering the
desired state (acquisition memory) location from the front-panel
keypad.
This lets you view corresponding areas of all lists, to cross check
alignment, and to analyze the bits that do not match.
Copy Listing to Reference field
The initial Reference image is generated by either copying the data
listing from the listing menu or by loading an analyzer configuration file
which contains a Reference listing. Be aware that if you load an
analyzer configuration to get a Reference image, the other menu setups
will change.
When the Copy Listing to Reference field is selected, the contents of
the acquisition data structure (Listing menu display) are copied to the
Reference image buffer. The previous Reference image is lost if it has
not been saved to a disk.