Keysight 53230A - Using the Counter Web-Enabled Interface

The following example enables the NULL scaling function with 100.0 as the reference value.
CALC:SCAL:FUNC NULL
CALC:SCAL:REF 100.0
CALC:SCAL:STAT ON
CALC:STAT ON
READ?
See Also
CALCulate1:SCALe:FUNCtion
CALCulate1:SCALe:REFerence:AUTO
CALCulate1:SCALe:STATE
CALCulate1:STATe
Keysight 53220A/53230A Programmer's Reference 49
CALCulate1:SCALe:REFerence