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Sweep/Control
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The first set of rules is called
SA – Normal. Sweep Time Rules is set to SA-Normal on a Preset or
Auto Couple. These rules give optimal sweep times at a lossof 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 will result 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, though this is not guaranteed. Because of the faster sweep
times and still low errors,
SA-Normal is the preferred setting of Sweep Time Rules.
The third set of sweep time rules is called
Stimulus/Response and is automatically selected when an
integrated source is turned on, such as a Tracking Generator or a synchronized external source. The
sweep times for this set of rules are usually much faster for swept-response measurements.
Stimulus-response auto-coupled sweep times are typically valid in stimulus-response measurements
when the system’s frequency span is less than 20 times the bandwidth of the device under test. You can
select these rules manually (even if not making Stimulus-Response measurements) which will allow you
to sweep faster before the “Meas Uncal” warning comes on, but you are then not protected from the
over-sweep condition and may end up with uncalibrated results. However, it is commonplace in
measuring non-CW signals such as noise to be able to get excellent measurement accuracy at sweep rates
higher than those required for CW signal accuracy, so this is a valid measurement technique.
Auto
Sets the analyzer to automatically choose the Sweep Time Rules for the measurement.
SA - Normal
Chooses Sweep Time Auto Rules for optimal speed and generally sufficient accuracy.
Key Path: Sweep/Control, Sweep Setup, Sweep Time Rules
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
Couplings: Set on Preset or Auto Couple
Preset: ON
Initial S/W Revision: Prior to A.02.00
Key Path:
Sweep/Control, Sweep Setup, Sweep Time Rules
Example: :SWE:TIME:AUTO:RUL NORM
Dependencies: Not available (grayed out) when Source Mode=Tracking.
Couplings: Automatically selected unless Source is on
If directly selected, sets AUTO to Off