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1078
Meas Setup
When ADC Dither is on, the linearity of low-level signals is improved. The enhanced linearity is mostly
improved scale fidelity. The linearity improvements of dither are most significant for RBWs of 3.9 kHz
and less in swept mode, and FFT widths of 4 kHz and less in FFT mode.
The increased noise due to turning dither on is most significant in low band (0 to 3.6 GHz) with IF Gain
set to Low, where it can be about 0.2 dB.
Auto
Sets the ADC dither to automatic. The test set 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 test set 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
auto coupling or manual selection.
• When Sweep Type = FFT, IF Gain = Low whenever FFT IF Gain is set to "Low Gain," which cannot
happen by auto coupling.
Whenever the IF Gain is not low by this definition, Auto sets the dither to Off.
Key Path Meas Setup
Example ADC:DITH:HIGH Sets the ADC dither setting to High
ADC:DITH ON Sets the ADC dither setting to Medium
Remote Command [:SENSe]:ADC:DITHer[:STATe] OFF|ON|HIGH
[:SENSe]:ADC:DITHer[:STATe]?
Dependencies
Preset AUTO
Backwards Compatibility SCPI The old 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)
Initial S/W Revision Prior to A.02.00
Modified at S/W Revision A.02.00
Key Path
Meas Setup, ADC Dither
Remote Command [:SENSe]:ADC:DITHer:AUTO[:STATe] OFF|ON|0|1
[:SENSe]:ADC:DITHer:AUTO[:STATe]?
Example ADC:DITH:AUTO ON
Preset ON
State Saved Saved in instrument state