3 IQ Analyzer (Basic) Mode
3.1 Complex Spectrum Measurement
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 ON according to the rules below:
whenever the effective IF Gain is Low and the Digital IF BW is less than or equal to 8
MHz. Whenever the IF Gain is not low by this definition, Auto sets the dither to OFF.
On (Best Log Accy)
The ON setting of ADC Dither improves the linearity of low-level signals at the
expense of some noise degradation.
Example
:SPEC: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
:SPEC:ADC:DITH:OFF
LO Dither
When LO Dither is ON, the local oscillator frequency is rapidly changed by small,
random amounts. This helps spread the power of spurious signals within the
passband, which lowers their level, thus increasing dynamic range. This is only
required in very wide passbands, so this feature only appears with Option H1G.
Remote Command Complex Spectrum:
[:SENSe]:SPECtrum:LO:DITHer[:STATe] ON | OFF | 1 | 0
[:SENSe]:SPECtrum:LO:DITHer[:STATe]?
Streaming:
[:SENSe]:STReaming:LO:DITHer[:STATe] ON | OFF | 1 | 0
[:SENSe]:STReaming:LO:DITHer[:STATe]?
Example
:SPEC:LO:DITH 1
:SPEC:LO:DITH?
Dependencies Only available when the instrument has the Option H1G installed. If you try to turn on LO Dither in any
259 IQ Analyzer Mode User's &Programmer's Reference
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