Keysight Technologies 86120B, User Manual

Page: 104 / 273

102
Programming
Monitoring the Instrument
The error 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 over-
flows, the least recent errors remain in the queue, and the most recent error is dis-
carded. The length of the instrument’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 posi-
tion 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.”
For more information on reading the error queue, refer to
“ERRor” on page 211 .
For a list of errors messages, refer to “Error Messages” on page 253 .