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Remote Operation
Monitoring the Instrument
Error Queue
As errors are detected, they are placed in an error queue. Instrument specific
errors are indicated by positive values. General errors have negative values.
You can clear the error queue by reading its contents, sending the *CLS com-
mand, or by cycling the instrument's power. 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 overflows, the least recent
errors remain in the queue, and the most recent error is discarded. The length
of the instrument's error queue is 30 (29 positions for the error messages, and
1 position for the "Queue overflow" message). Querying errors 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."
Command
*CLS common command
SYSTem:ERRor?
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Use
Clears the error queue (and all event registers).
Returns and removes the oldest error from the
head of the queue.
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