B&K Precision 4040B - Manual - Manual (Page 57)

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length 10. The error queue is read with the following
query:
ERR?
The first error in the queue is returned, and the queue is
advanced.
4.7.2 Error Codes
The negative error codes are defined by SCPI. Positive
codes are specific to the instrument.
The error message is returned in the form
,""
A table of error numbers and their descriptions is
presented here.
No error reported
0 - No error
Command Errors
A command error is in the range -199 to -100, and
indicates that a syntax error was detected. This includes
the case of an unrecognized header.
-100 Command Error