Agilent Technologies 86121A User Manual page 88

Wdm channel analyzer
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Monitoring the Instrument 4-21
and the most recent error is discarded. The length of
the error queue in the instrument is 30 (29 positions for
the error messages, and 1 position for the "Queue over-
flow" message).
The error queue is read with the SYSTEM:ERROR?
query. Executing this query reads and removes the old-
est 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, subse-
quent error queries return 0, "No error".
For more information on reading the error queue, refer
to
":SYSTem:ERRor?" on page
5-57. For a list of error
messages,
refer to "Error Messages" on page
8-3.

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