Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Range
OFF|ON|HIGH
Backwards
Compatibility SCPI
[:SENSe]:ADC:DITHer AUTO
Backwards
Compatibility
Notes
The command:
[:SENSe]:ADC:DITHer AUTO
is aliased to:
[:SENSe]:ADC:DITHer:AUTO[:STATe] ON
Because of this, the [:SENSe]:ADC:DITHer function cannot be a true Boolean, so the query,
[:SENSe]:ADC:DITHer? returns OFF or ON (not 1 or 0 like a true Boolean)
Auto Function
Remote Command
[:SENSe]:ADC:DITHer:AUTO[:STATe] OFF | ON | 0 | 1
[:SENSe]:ADC:DITHer:AUTO[:STATe]?
Example
:ADC:DITH:AUTO ON
Preset
ON
Option Details
Detail on the settings follows:
Auto
Sets the ADC dither to automatic. The instrument then chooses the dither level
according to which is most likely to be the best selection, based on other settings
within the digital IF.
When in Auto, the instrument sets the dither to Medium whenever the effective IF
Gain is Low by this definition of IF Gain = Low:
–
When Sweep Type = Swept, IF Gain = Low whenever Swept IF Gain is set to Low
Gain, whether by autocoupling or manual selection
–
When Sweep Type = FFT, IF Gain = Low whenever FFT IF Gain is set to "Low
Gain," which cannot happen by autocoupling
Whenever the IF Gain is not Low by this definition, Auto sets the dither to Off.
Example
:ADC:DITH:AUTO ON
High (Best Log Accy)
When ADC Dither is set to High, the scale fidelity is especially good, most notably
the relative scale fidelity. The tradeoff is that there is a modest loss of noise floor
performance, up to about a decibel.
Spectrum Analyzer Mode User's &Programmer's Reference 439

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)