3 VMA Mode
3.4 IQ Waveform Measurement
Option Option # Phase Noise Option Range
EP2, EP3, EP5 1 Best Close-in [offset < 70 kHz]
2 Best Wide-offset [offset > 100 kHz]
3 Fast Tuning [medium loop bw]
EP4 1 Best Close-in [offset < 90 kHz]
2 Best Wide-offset [offset > 130 kHz]
3 Fast Tuning [same as Best Close-In]
ADC Dither
Toggles the dither function On and Off. The dither function improves linearity for low
level signals, at the expense of a higher noise floor.
The reduced clipping-to-noise ratio results in higher noise because the clipping
level of the ADC relative to the front terminals remains unchanged with the
introduction of dither. The enhanced linearity is mostly improved scale fidelity.
With dither on, the third-order distortions are usually invisible for mixer levels below
-35 dBm. With dither off, these distortions can be visible, with typical power levels of
-110 dBm referred to the mixer. Detection nonlinearity can reach 1 dB for dither off
at mixer levels around -70 dBm and lower, while the specified nonlinearity is many
times smaller with dither on.
Remote
Command
[:SENSe]:WAVeform:ADC:DITHer[:STATe] OFF | ON | 0 | 1
[:SENSe]:WAVeform:ADC:DITHer[:STATe]?
Example
:WAV:ADC:DITH ON
:WAV:ADC:DITH?
Notes The dither function improves linearity for low level signals, at the expense of a higher noise floor
Preset
OFF
State Saved Saved in instrument state
Range
ON|OFF
Backwards
Compatibility
SCPI
[:SENSe]:WAVeform:WBIF:ADC:DITHer
[:SENSe]:WAVeform:PDITher
Auto Function
Remote
Command
[:SENSe]:WAVeform:ADC:DITHer:AUTO[:STATe] OFF | ON | 0 | 1
[:SENSe]:WAVeform:ADC:DITHer:AUTO[:STATe]?
Example
:WAV:ADC:DITH:AUTO ON
:WAV:ADC:DITH:AUTO?
Notes Sets ADC dithering to automatically select whether dithering is needed
773 Vector Modulation Analyzer Mode User's &Programmer's Reference
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