Keysight A Series User Manual page 315

IQ Analyzer (IQA) – Option 351 (CPU2 Only)
I/Q Analyzer (IQA) Mode Settings
By default, the preamp is OFF.
— Press Scale/Amptd.
— Then
— Then
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Preamp Off The displayed setting is the current setting. When ON,
is shown to the left of the graticules on the display (default: OFF). When
OFF, nothing is displayed in the left graticules.
When Auto is selected, the preamp setting is determined by the RF
attenuation and to the input power level. When the input power level
reaches a certain value, the preamp is turned on and
of the graticules on the display.
PA
PA is shown to the left
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