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Agilent InfiniiVision 3000 X-Series Oscilloscopes Programmer's Guide 841

As errors are detected, they are placed in an error queue. This queue is

first in, first out. If the error queue overflows, the last error in the queue

is replaced with error 350, Queue overflow. Any time the queue overflows,

the least recent 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:

• the instrument is powered up,

• the instrument receives the *CLS common command, or

• the last item is read from the error queue.

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Agilent Technologies InfiniiVision 3000 DSO-X 3054A Manuale di Servizio Pagina 841