Agilent Technologies Infiniium 90000 Q-Series, Programmer'S Manual

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Status Reporting
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Agilent Infiniium 90000 Series Oscilloscopes Programmer's Reference 123
Error Queue
As errors are detected, they are placed in an error queue. This queue is a
first- in, first- out queue. If the error queue overflows, the last error in the
queue is replaced with error - 350, "Queue overflow." Any time the queue
overflows, the oldest errors remain in the queue, and the most recent
error is discarded. The length of the oscilloscope's error queue is 30 (29
positions for the error messages, and 1 position for the "Queue overflow"
message).
The error queue is read with the :SYSTEM:ERROR? query. Executing this
query reads and removes the oldest error from the head of the queue,
which opens a position at the tail of the queue for a new error. When all
the errors have been read from the queue, subsequent error queries return
0, "No error."
The error queue is cleared when any of these events occur:
• When the oscilloscope is powered up.
• When the oscilloscope receives the *CLS common command.
• When the last item is read from the error queue.
For more information on reading the error queue, refer to the
:SYSTEM:ERROR? query in the System Commands chapter. For a complete
list of error messages, refer to the chapter, "Error Messages."