Keysight x-series User Reference Manual page 743

The instrument takes the preamp gain into account as it sweeps. If you sweep outside of the range of the
preamp the instrument will also account for that. The displayed result will always reflect the correct gain.
For some measurements, when the preamp is on and any part of the displayed frequency range is below
the lowest frequency for which the preamp has specifications, a warning condition message appears in the
status line. For example ,for a preamp with a 9 kHz lowest specified frequency: "Preamp: Accy unspec'd
below 9 kHz".
Key Path
Scope
Remote Command
Dependencies
Couplings
Preset
State Saved
Initial S/W Revision
Modified at S/W Revision
Key Path
Scope
Remote Command
Dependencies
Preset
State Saved
Initial S/W Revision
EMI Receiver Mode Reference
AMPTD Y Scale
Meas Global
[:SENSe]:POWer[:RF]:GAIN[:STATe] OFF|ON|0|1
[:SENSe]:POWer[:RF]:GAIN[:STATe]?
Preamp is not available on all hardware platforms. If the preamp is not present or is unlicensed, the
key is not shown.
The preamp is not available when the electronic/soft attenuator is enabled.
The act of connecting the U7227A USB Preamplifier to one of the analyzer's USB ports will cause
the Internal Preamp to be switched on. When this happens an informational message will be
generated: "Internal Preamp turned on for optimal operation with USB Preamp." Note that if the
Internal Preamp was already on, there will be no change to the setting, but if it was Off it will be
switched On, to Full Range.
Note that this same action occurs when the SA mode is selected while the USB Preamp is
connected to one of the analyzer's USB ports, if it is the first time that the SA mode has run since
powerup, or if the last time the SA mode was running the USB Preamp was NOT connected.
Subsequently disconnecting the USB Preamp from USB does not change the Internal Preamp setting
nor restore the previous setting.
OFF
Saved in instrument state
Prior to A.02.00
A.14.00
AMPTD Y Scale, Internal Preamp
Meas Global
[:SENSe]:POWer[:RF]:GAIN:BAND LOW|FULL
[:SENSe]:POWer[:RF]:GAIN:BAND?
Preamp is not available on all hardware platforms. If the preamp is not present or is unlicensed, the
key is not shown.
If a POW:GAIN:BAND FULL command is sent when a low band preamp is available, the preamp band
parameter is to LOW instead of FULL, and an "Option not installed" message is generated.
LOW
Saved in instrument state
Prior to A.02.00
10 Monitor Spectrum Measurement
AMPTD Y Scale
743