3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
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Compatibility
Notes
:SWEep:TIME:AUTO:MODE SANalyzer is aliased to :SWEep:TIME:AUTO:RULes
NORMal
:SWEep:TIME:AUTO:MODE SRESponse is aliased to :SWEep:TIME:AUTO:RULes
SRESponse
The query is aliased to :SWEep:TIME:RULes?, so it matches for SRESponse but not for
SANalyzer
The old Auto Sweep Time command was the same:
[:SENSe]:SWEep:TIME:AUTO:RULes NORMal | ACCuracy
so, it still works although it now has a third parameter (SRESponse)
Auto Function
Remote
Command
[:SENSe]:SWEep:TIME:AUTO:RULes:AUTO[:STATe] ON | OFF | 1 | 0
[:SENSe]:SWEep:TIME:AUTO:RULes:AUTO[:STATe]?
Example
:SWE:TIME:AUTO:RUL:AUTO ON
:SWE:TIME:AUTO:RUL:AUTO?
Couplings Set on Preset or by "Auto Couple" on page 2017
Preset
ON
Option Details
Value SCPI Notes
Auto AUTO = ON When in Auto, the Sweep Time Rules are set to SA-Normal
SA - Normal
NORMal
This selection selects auto rules for optimal speed and generally sufficient
accuracy
SA - Accuracy
ACCuracy
This selection selects auto rules for specified absolute amplitude accuracy
Stimulus /
Response
SRESponse
This selection selects auto rules for the case where the instrument is sweeping in
concert with a source
Automatically selected when the Source is on (Source Mode not set to OFF)
Sweep Time Rules is set to SA-Normal on a Preset or Auto Couple. These rules give
optimal sweep times at a loss of accuracy. Note that this means that in the Preset or
Auto Coupled state, instrument amplitude accuracy specifications do not apply.
Setting Sweep Time Rules to SA-Accuracy results in slower sweep times than SA-
Normal, usually about three times as long, but with better amplitude accuracy for
CW signals. The instrument absolute amplitude accuracy specifications only apply
when Sweep Time is set to Auto, and Sweep Time Rules are set to SA-Accuracy.
Additional amplitude errors, which occur when Sweep Time Rules are set to SA-
Normal, are usually well under 0.1 dB with non-EMI detectors (though this is not
guaranteed). With EMI detectors (Quasi Peak, EMI Average and RMS Average), the
errors are usually well under 0.5 dB. For best accuracy when using EMI detectors,
zero span is the preferred measurement technique; for the EMI detectors, zero span
Spectrum Analyzer Mode User's &Programmer's Reference 495
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