User`s guide

Remarks
The calculation function to be used is selected using the
CALCulate:FUNCtion command.
CALCulate:STATe is set to OFF when the measurement function is
changed.
When CALCulate:STATe:ON is sent the math registers for limits, statistics,
dB relative value, and the value set by CALCulate:NULL:OFFSet are
cleared. This also occurs when CALCulate:FUNCtion is sent with
CALCulate:STATe previously set to ON. Note that the dBm reference
resistance value is not cleared in either case.
The instrument resets the calculation state to off after a Factory Reset
(*RST command), an Instrument Preset (SYSTem:PRESet command), or a
function change.