Agilent Technologies 34401A - Manual (Page 186)

616 DC current sense failed
617 Ohms 100 uA source failed
618 DC high voltage attenuator failed
619 Ohms 1 mA source failed
620 AC rms zero failed
621 AC rms full scale failed
622 Frequency counter failed
623 Cannot calibrate precharge
624 Unable to sense line frequency
625 I/O processor does not respond
626 I/O processor failed self-test
Calibration Errors
The following errors indicate failures that may occur during a
calibration. Refer to the Service Guide for more information.
701 Cal security disabled by jumper
The calibration security feature has been disabled with a jumper inside
the multimeter. When applicable, this error will occur at power-on to
warn you that the multimeter is unsecured.
702 Cal secured
The multimeter is secured against calibration.
Chapter 5 Error Messages
Calibration Errors
180