User`s guide

150 Agilent 34980A Mainframe User’s Guide
3 Features and Functions
Error Conditions
When the front panel ERROR annunciator turns on, one or more command
syntax or hardware errors have been detected. A record of up to 20 errors
can be stored in the instrument’s error queue. Each remote interface I/O
session (i.e., GPIB, USB, LAN, etc.) has its own interface- specific error
queue. Errors appear in the error queue of the I/O session that caused 
the error (the front panel reports errors from all I/O sessions).
For a complete listing of the error messages, see the Agilent 34980A
Programmer’s Reference Help file, located on the Product Reference
CD- ROM shipped with the instrument.
• The instrument beeps once each time a command syntax or hardware
error is generated.
• A special global error queue holds all power- on and hardware- related
errors (e.g., over- temperature, Safety Interlock, etc.).
• Errors are retrieved in first- in- first- out (FIFO) order. The first error
returned is the first error that was stored. Errors are cleared as you
read them. Once you have read all of the interface- specific errors, the
errors in the global queue are retrieved.
• Errors are cleared as you read them. When you have read all errors
from the interface- specific and global error queues, the ERROR
annunciator turns off and the errors are cleared.
• If more than 20 errors have occurred, the last error stored in the queue
(the most recent error) is replaced with - 350,“Error queue overflow”.
No additional errors are stored until you remove errors from the queue.
If no errors have occurred when you read the error queue, the
instrument responds with +0,“No error”.
• The front panel reports errors from all I/O sessions as well as the
global error queue.
• The interface- specific and global error queues are cleared by the
*CLS
(Clear Status) command and when power is cycled. The errors are also
cleared when you read the error queue. The error queue is not cleared
by a Factory Reset (
*RST command) or an Instrument Preset
(
SYSTem:PRESet command).
Front Panel Operation: View > ERROR QUEUE
Use the knob to scroll through the errors. Press the right arrow key to
view the text of the error message. All errors are cleared when you exit
the menu.
Remote Interface Operation: The following command reads and clears one
error from the queue
.
SYSTem:ERRor?