Agilent Technologies L4400 manual Error Conditions

Operating and Programming 3

Error Conditions

Usage:

•All L4400 Series Instruments

When the L4400 instrument’s front panel ATTN LED is red, 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.

For a complete listing of the error messages, see the Programmer’s Reference Help file located on the Agilent L4400 Product Reference CD- ROM that ships with the instrument.

•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 ATTN annunciator turns off.

•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 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).

The following command is used to read errors from the error queue. One error is read per command.

SYSTem:ERRor?

L4400 User’s Guide 97