Specifications

366 Appendix H
Error messages
Error number: No number
Error messages are displayed at the top of the 4287A’s LCD. Error messages generated
during the execution of a GPIB command are preceded by the string “[GPIB]” or
“[TELNET]” and can be read out using the GPIB command. This section describes each
error message and its remedy.
You can clear error messages displayed on the screen using the following commands.
• :DISP:CCL on page 269
NOTE Errors with a negative error number are basically general errors defined by IEEE488.2 for
GPIB instruments. On the other hand, errors with a positive error number are defined
specifically for the 4287A.
Order of error number
No number A21 board can't be detected. The instrument will be automatically shutdown
in 20 seconds.
The A21 board cannot be detected.
The 4287A will be automatically shut down in approximately 20 seconds after the
occurrence of this error. The 4287A is at fault and needs repair.
Contact the Agilent Technologies sales office or the company you purchased this
instrument.
NOTE This is a special error that occurs at the startup of the 4287A. The error message, unlike
other ones, is displayed in the box that appears at the center of the LCD display, instead of
the top of it. No error number is assigned.
No number A24 GPIB board can't detected. Press OK to continue.
The A24 board cannot be detected.
Although the measurement screen appears normally, the instrument has started up
abnormally (GPIB is disabled). To recover the normal status, reboot the 4287A (turn OFF
the standby switch and then ON again).
If this error persists after rebooting the 4287A, or occurs frequently, the 4287A is at fault
and needs repair. Contact the Agilent Technologies sales office or the company you
purchased this instrument.
NOTE This is a special error that occurs at the startup of the 4287A. The error message, unlike
other ones, is displayed in the box that appears at the center of the LCD display, instead of
the top of it. No error number is assigned.