Keysight Technologies 34450A Programmer's Reference Manual page 57

Examples
The following commands store a message in calibration memory.
CAL:STR "CAL: 21 Nov 2005" or CAL:STR 'CAL: 21 Nov 2010'
The following query returns the message currently stored in calibration memory (the quotes are also
returned).
CAL:STR?
Typical Response: "CAL: 21 Nov 2010"
See Also
CALibration:SECure:STATe
Keysight 34450A Programmer's Reference
2 SCPI Programming
57