Remote Operations Using the IEEE 488 Interface
Syntax Diagram of Test
4
Recall dB Reference Value
DB_REF?
adj240f.eps
Recall dB Reference Value
DB_REF?
(Nr3) Recalls the current value of the DB_REF voltage.
The value returned is the voltage value assigned to the program data elements:
The element UNITY: +1.00000000E+00.
The element R50: +223.606800E-03.
The element R75: +273.861280E-03.
The element R600: +774.596670E-03.
Syntax Diagram of Test
Selftest
This command conforms to the IEEE 488.2 standard requirements.
TST?
∗
adj241f.eps
Selftest
∗TST?
Executes a selftest.
The success of Selftest can be inhibited by:
• Temperature not in the range: 5 °C to 40 °C.
• Presence of excessive RFI or Line noise.
Response
(Nr1) The value returned identifies pass (0) or failure (1) of self test. The errors numbers
can be found in the device dependent error queue.
Execution Errors:
Selftest is not permitted when calibration is enabled.
Device Errors and Syntax Diagrams
Error Detection
All errors which cannot be recovered transparently result in some system action to inform
the user via a message, and where possible restore the system to an operational condition.
Errors are classified by the method with which they are handled.
• Recoverable errors report the error and continue.
• System errors which cannot be recovered cause the system to halt with a message
displayed. Restarting the system from power on may clear the error, but generally
such messages are caused by hardware or software faults.
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