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Chapter 12 253
Troubleshooting
Contacting Agilent Sales and Service Offices
The <error_message> string for a positive error is not defined by SCPI. A positive error indicates that
the instrument detected an error within the GPIB system, within the instrument’s firmware or
hardware, during the transfer of block data, or during calibration.
Execution Errors (–299 to –200) indicate that an error has been detected by the instrument’s
execution control block. Errors in this class set the execution error bit (bit 4) in the event status
register (IEEE 488.2, section 11.5.1). In this case:
• Either a <PROGRAM DATA> element following a header was evaluated by the device as outside of
its legal input range or is otherwise inconsistent with the device’s capabilities, or
• a valid program message could not be properly executed due to some device condition.
Execution errors are reported after rounding and expression evaluation operations are completed.
Rounding a numeric data element, for example, is not reported as an execution error.
Command Errors (–199 to –100) indicate that the instrument’s parser detected an IEEE 488.2
syntax error. Errors in this class set the command error bit (bit 5) in the event status register
(IEEE 488.2, section 11.5.1). In this case:
• Either an IEEE 488.2 syntax error has been detected by the parser (a control-to-device message
was received that is in violation of the IEEE 488.2 standard. Possible violations include a data
element that violates device listening formats or whose type is unacceptable to the device.), or
• an unrecognized header was received. These include incorrect device-specific headers and
incorrect or unimplemented IEEE 488.2 common commands.
Contacting Agilent Sales and Service Offices
Assistance with test and measurement needs, and information on finding a local Agilent office are
available on the Internet at:
http://www.agilent.com/find/assist
You can also purchase E8257D/67D PSG accessories or documentation items on the Internet at:
http://www.agilent.com/find/psg
If you do not have access to the Internet, contact your field engineer.
NOTE In any correspondence or telephone conversation, refer to the signal generator by its model
number and full serial number. With this information, the Agilent representative can
determine whether your unit is still within its warranty period.
Returning a Signal Generator to Agilent Technologies
To return your signal generator to Agilent Technologies for servicing, follow these steps:
1. Gather as much information as possible regarding the signal generator’s problem.
2. Call the phone number listed on the Internet (http://www.agilent.com/find/assist) that is specific
to your geographic location. If you do not have access to the Internet, contact your field engineer.
After sharing information regarding the signal generator and its condition, you will receive
information regarding where to ship your signal generator for repair.
3. Ship the signal generator in the original factory packaging materials, if available, or use similar
packaging to properly protect the signal generator.