Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Example
:ADC:DITH:HIGH
Medium (Log Accy)
The Medium setting of ADC Dither (known as “On” in earlier versions of the
instrument software) improves the linearity of low-level signals at the expense of
some noise degradation.
Example
:ADC:DITH:ON
Off (Best Noise)
When ADC Dither is Off, the instrument noise floor is improved, because without the
need to make room for the dither, you get a lower noise floor and better sensitivity.
Example
:ADC:DITH:OFF
Swept IF Gain
To take full advantage of the RF dynamic range of the instrument, there is an added
switched IF amplifier with approximately 10dB of gain. When you can turn it on
without overloading the instrument, the dynamic range is always better with it on
than off. The Swept IF Gain control can be used to set IF Gain to Auto, to High Gain
(the extra 10 dB), or to Low Gain. These settings affect sensitivity and IF overloads.
This function is only active when in Swept sweeps. In FFT sweeps, the FFT IF Gain
function is used instead.
Option SCPI Details
Auto AUTO = ON "Auto" on page 441
Low
OFF
"Low Gain (Best for Large Signals)" on page 441
High
ON
"High Gain (Best Noise Level)" on page 441
Remote Command
[:SENSe]:IF:GAIN:SWEPt[:STATe] OFF | ON | 0 | 1
[:SENSe]:IF:GAIN:SWEPt[:STATe]?
Example
:IF:GAIN:SWEP ON
Dependencies The IF Gain keys (FFT IF Gain and Swept IF Gain) have no effect when the U7227A USB Preamplifier is
connected. This is not annotated or reflected on any control; there are no keys grayed-out nor any
SCPI locked out. The instrument simply behaves as though both FFT IF Gain and Swept IF Gain are set
to Low regardless of the setting on the keys
Couplings The ‘auto’ rules for Swept IF Gain depend on attenuation, preamp state, start and stop frequency and
the setting of FFT IF Gain. Set the Swept IF Gain to High (On) when the total input attenuation is 0 dB,
the preamp is off, the start frequency is 10 MHz or more, and the FFT IF Gain is autocoupled, or
manually set to Autorange, or manually set to High. Also set the Swept IF Gain to High (On) when the
440 Spectrum Analyzer Mode User's &Programmer's Reference

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)