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Sweep/Control
SA - Accuracy
Chooses Sweep Time Auto Rules for specified absolute amplitude accuracy.
NOTE For specified accuracy, do not allow sweep time to fall below 20 ms when in SA -
Accuracy
Stimulus/Response
The Stimulus-Response setting for sweep time rules provides different sweep time settings, for the case
where the analyzer is sweeping in concert with a source. These modified rules take two forms:
1. Sweeping along with a swept source, which allows faster sweeps than the normal case because the
RBW and VBW filters do not directly interact with the Span. We call this “Swept Tracking”
2. Sweeping along with a stepped source, which usually slows the sweep down because it is necessary to
wait for the stepped source and the analyzer to settle at each point. We call this “Stepped Tracking”
The analyzer chooses one of these methods based on what kind of a source is connected or installed; it
picks Swept Tracking if there is no source in use.
As always, when the X-series analyzer is in Auto Sweep Time, the sweep time is estimated and
displayed in the Sweep/Control menu as well as in the annotation at the bottom of the displayed
measurement; of course, since this can be dependent on variables outside the analyzer’s control, the
actual sweep time may vary slightly from this estimate.
You can always choose a shorter sweep time to improve the measurement throughput, (with some
potential unspecified accuracy reduction), but the Meas Uncal indicator will come on if the sweep time
you set is less than the calculated Auto Sweep time. You can also select a longer sweep time, which can
be useful (for example) for obtaining accurate insertion loss measurements on very narrowband filters.
The number of measurement points can also be reduced to speed the measurement (at the expense of
frequency resolution).
Readback: SA - Normal
Initial S/W Revision: Prior to A.02.00
Key Path:
Sweep/Control, Sweep Setup, Sweep Time Rules
Example: :SWE:TIME:AUTO:RUL ACC
Dependencies: Not available (grayed out) when Source Mode=Tracking.
Couplings: If directly selected, sets AUTO to Off
Readback: SA - Accuracy
Initial S/W Revision: Prior to A.02.00
Key Path:
Sweep/Control, Sweep Setup, Sweep Time Rules
Example: :SWE:TIME:AUTO:RUL SRES