Trace not working after applying the recommended calibration values
24-May-2024
In corner cases, it can happen that multiple valid regions are visible in
the trace calibration diagram (shown as gaps or ‘eyes’) and a non-working
setting is recommended by the Trace Line Calibration tool. When such a
setting is selected, the trace session will fail to trigger and the analyzer
will remain in the WAITING state.
The above image shows an example of a situation where the calibration
diagram shows two potentially valid eyes of which only one results in a
working trace connection.
Possible solutions
Run the trace calibration multiple times
Check if the recommended value (shown as R) moves within the diagram
while executing the trace calibration multiple times. If the recommended
value jumps between two separate eyes, try the recommended calibration
setting for both options.
Manually set the calibration values
Observe the calibration diagram for larger eyes within the field of X’s and
manually determine and enter the Phase and Vref values based
on the center of the respective eye.
Small eyes in the calibration diagram are a result of signal integrity issues. Signal distortion can prevent the BlueBox from capturing the trace stream correctly. Refer to this article for more information.
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