3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
The resolution of setting the sweep time depends on the number of points selected
Preset 1001
State Saved Saved in instrument state
Min Normally the minimum is 1, but in TrackingSource Mode, the minimum value of Points is 101. If you go
into TrackingSource Mode with fewer points than 101, it sets Points to 101
Max 20001 all measurements unless noted below
100,001 when not in Tracking Source Mode
In Tracking Source Mode:
–
in Stepped Tracking (for example, External Source), 1601 or the maximum number of points
supported by the source, whichever is less
–
in Swept Tracking with the CXA TG, 10000
–
in Stepped Tracking with the CXA-m TG, 16000
Annotation On second line of annotations, in lower right corner in parenthesis behind the sweep annotation
Traces are drawn by connecting the trace points, so below is what a 5-point trace
with start frequency of 0 and stop frequency of 4 GHz would look like. Note that the
black dots at the bucket centers are not actually drawn, but are for illustrative
purposes only.
The first bucket (for measurement purposes) actually begins at start – (span/2
(sweep_points – 1)), and the last bucket extends to stop + (span/2(sweep_points –
1)). However, the first bucket is drawn starting at start, so only half the bucket is
drawn, and the last bucket is drawn ending at stop, so only half of the last bucket is
drawn.
The limiting case for which this applies is the two-bucket trace, which looks like this:
Spectrum Analyzer Mode User's &Programmer's Reference 501
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