Creating A Compare Image - HP 1652B Getting Started Manual

The controls that roll the listing in all three menus, the normal State
Listing, the Compare Listing, and the Difference Listing are
synchronized unless the number of pre-trigger states differ between the
Compare listing and the acquired data. This means that when you
change the current row position in the Difference Listing, the logic
analyzer automatically updates the current row in the acquired State
Listing, Compare Listing and vice-versa.
If the three listings are synchronized and you re-acquire data, the
Compare Listing may have a different number of pre-trigger states
depending on the state trace trigger criteria. The Compare Listing can
be resynchronized to the State and Difference Listings (if different) by
entering the desired state (acquisition memory) location from the
front-panel keypad.
This allows you to view corresponding areas of the two lists, to cross
check the alignment, and analyze the bits that do not match.
Since time tags are not required to perform the compare, they do not
appear in either the compare image or difference displays. However,
correlation is possible since the displays are locked together.
To move between the State Listing and Compare Listing in the
HP 1652B/53B, select the field directly to the right of your state
machine's label, in the upper left most part of the screen and press
SELECT. When this field is selected, a pop-up wiIl appear. Select the
State Listing field from this pop-up.
Creating a
An initial compare image can be generated by copying acquired data
Compare Image
into the compare image buffer. When you place the cursor on the
Copy Trace to Compare
field in the Compare Listing menu a pop-up
appears with the options
Cancel
and
Continue.
If
the Continue is
selected, the contents of the acquisition data structure for the current
machine are copied to the compare image buffer. The previous
compare image is lost if it has not been saved to a disk. If you select
Cancel
the current compare image remains unchanged.
HP 16528/1653B
Front-Panel Reference
State Compare Menu
12-3