HP 6621A, 6623A, 6624A manual 111

Table D-2. ERROR Responses (continued)

Error Code	Message	Explanation
(ERR? query)	(ERR key)
17	UNCALIBRATED	Unexplained EEPROM error; possibly as the result of incorrect calibration
		procedure. Recalibrate as described in Appendix A. If the problem persists, a
		hardware failure exists (Refer to the Troubleshooting Section in the Service
		Manual).
18	CAL LOCKED	Calibration was attempted with the calibration jumper on the HP-IB board in
		the lockout position (See Chapter 4 in the Service Manual). Reposition the
		jumper and re-calibrate if this is desired.
22	SKIP SLF TST	The self test jumper on the HP-IB board is in the Skip Self Test Position (See
		Chapter 4 in the Service Manual). Reposition the jumper and carry out self-test
		if this is desired.

	Table D-3. TEST? Responses
Response Code	Explanation
(TEST? query)
0	No errors were detected.
20	The timer on the HP-IB board failed self test. Refer to the Troubleshooting Section in the Service
	Manual.
21	The RAM on the HP-IB board failed self test. Refer to the Troubleshooting Section in the Service
	Manual. Note that if this failure occurred at power-on, it cannot be displayed on the front panel.
27	The ROM on the HP-IB board failed self test. Refer to the Troubleshooting Section in the Service
	Manual. Note that if this failure occurred at power-on, it cannot be displayed on the front panel.

Error Codes and Messages 111