402 Chapter6
Error Messages
Error Message Descriptions
Instrument-Specific Error Messages
[positive numbers]
Some instrument-specific error messages use the existing negative or
“generic” SCPI error numbers with the addition of device-dependent or
instrument-specific information following the semicolon in the error
message. A positive error number indicates that the instrument has
detected an error within the GPIB system, within the instrument
firmware or hardware, during the transfer of block data, or during
calibration.
An error number in the positive range indicates that the instrument
has detected an error relating to the core operation [1 to 99], or to a
personality loaded into the instrument, GSM [100 to 199] or CDMA
[200 to 299].
Core-Specific Error Messages
[1 to 99]
An error number in the range [1 to 99] indicates the instrument has
detected an error relating to the core functionality of the instrument.
Core-Specific Error Message Descriptions
(Number) Description
(1) Synthesizer unlocked
The A19 synthesizer assembly has lost phase lock.
Suspect a problem with the A19 hardware or absence of
10 MHz from the A18 reference assembly.
(2) Frequency reference unlocked
The 100 MHz VCXO on the A18 reference assembly is
no longer phase locked. Possible causes are; a faulty
internal OCXO, the external reference bad or missing,
or faulty phase lock circuitry on the A18 reference
assembly.
(3) Third LO unlocked
The third LO on the A12 analog IF assembly has lost
phase lock. Possible causes are; a faulty A12 analog IF
assembly, or a missing 10 MHz from the A18 reference
assembly.
(4) Cal oscillator unlocked
The 42.8 MHz calibrator oscillator on the A12 analog IF
assembly is unlocked.
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