Keysight Technologies 34450A Programmer's Reference Manual page 33

Return Format
The query returns the currently selected function: NULL, DB, DBM, AVER, HOLD or LIM.
Examples
The following command sequence sets the function to be calculated to DBM.
CALC:FUNC DBM
CALC:STAT ON
CALC:DBM:REF 16
The following query returns the currently enabled calculation function.
CALC:FUNC?
Typical Response: DBM
See Also
CALCulate:STATe
Keysight 34450A Programmer's Reference
2 SCPI Programming
33