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Sweep/Control
Sweep/Control
Accesses a menu that enables you to configure the Sweep and Control functions of the analyzer, such as
Sweep Time and Gating.
Sweep Time
Controls the time the analyzer takes to sweep the current frequency span when the Sweep Type is Swept,
and displays the equivalent Sweep Time when the Sweep Type is FFT.
When Sweep Time is in Auto, the analyzer computes a sweep time which will give accurate
measurements based on other settings of the analyzer, such as RBW and VBW.
NOTE Significantly faster sweep times are available for the Swept SA measurement with
Option FS1.
The Meas Uncal (measurement uncalibrated) warning is given in the Status Bar in
the lower right corner of the screen when the manual sweep time entered is faster
than the sweep time computed by the analyzer’s sweep time equations, that is, the
Auto Sweep Time. The analyzer’s computed sweep time will give accurate
measurements; if you sweep faster than this your measurements may be
inaccurate. A Meas Uncal condition may be corrected by returning the Sweep
Time to Auto; by entering a longer Sweep Time; or by choosing a wider RBW
and/or VBW
On occasion other factors such as the Tracking Generator’s maximum sweep rate,
the YTF sweep rate (in high band) or the LO’s capability (in low band) can cause a
Meas Uncal condition. The most reliable way to correct it is to return the Sweep
Time to Auto.
If the analyzer calculates that the Auto Sweep Time would be greater than 4000s
(which is beyond its range), the warning message “Settings Alert;Sweep Rate
Unavailable” is displayed. In this case increase the RBW or reduce the span.
If the anzlyzer’s estimated sweep time in an FFT sweep is greater than 4000s, the
warning message “Settings Alert;Span:RBW Ratio too big” is displayed. In this
case reduce the span or increase the RBW and/or FFT Width.
When Sweep Type is FFT, you cannot control the sweep time, it is simply reported by the analyzer to
give you an idea of how long the measurement is taking.
Note that although some overhead time is required by the analyzer to complete a sweep cycle, the sweep
time reported when Sweep Type is Swept does not include the overhead time, just the time to sweep the
LO over the current Span. When Sweep Type is FFT, however, the reported Sweep Time takes into
account both the data acquisition time and the processing time, in order to report an equivalent Sweep
Key Path: Front-panel key
Initial S/W Revision: Prior to A.02.00