Technical data

16 Error Messages
152 U2761A Programmer’s Reference
Query errors
The list of query errors is shown in the following table.
Instrument errors
The instrument errors are listed in the following table.
Tabl e 16-4 Query errors
Error number Query errors
–410 Query INTERRUPTED
A condition causing an interrupted query error occurred
–420 Query UNTERMINATED
A condition causing an unterminated query error occurred
–430 Query DEADLOCKED
A condition causing a deadlocked query error occurred
–440 Query UNTERMINATED after indefinite response
A query was received in the same program message after a query indicating an indefinite response was
executed
Tabl e 16-5 Instrument errors
Error number Instrument errors
501 to 502 501: Cross-isolation UART framing error
502: Cross-isolation UART overrun error
Indicate an internal hardware failure. The isolation between chassis ground circuits and floating circuits is
controlled by an optical isolation barrier and a serial link.
580 Reference phase-locked loop is unlocked
The phase-lock error status has been enabled and the internal phase-locked loop that controls the
frequency is currently unlocked. This error is most likely to occur when the external reference is out of lock
range.