R&S FSW Series User Manual

Common Analysis and Display Functions
R&S
®
FSW
590User Manual 1173.9411.02 ─ 43
Time Frames
The time information in the spectrogram is displayed vertically, along the y-axis. Each
line (or trace) of the y-axis represents one or more captured sweep and is called a
time frame or simply "frame". As with standard spectrum traces, several measured
values are combined in one sweep point using the selected detector.
(See "Mapping Samples to sweep Points with the Trace Detector" on page 575).
Frames are sorted in chronological order, beginning with the most recently recorded
frame at the top of the diagram (frame number 0). With the next sweep, the previous
frame is moved further down in the diagram, until the maximum number of captured
frames is reached. The display is updated continuously during the measurement, and
the measured trace data is stored. Spectrogram displays are continued even after sin-
gle measurements unless they are cleared manually.
In three-dimensional spectrograms, frames are displayed vertically. The most recently
recorded frame (frame 0) is added at the front of the display (in the default position).
For more information, see "Three-Dimensional Spectrograms" on page 592.
The maximum number of frames that you can capture is summarized in Table 9-5.
Table 9-5: Correlation between number of sweep points and number of frames stored in the history
buffer
Sweep Points Max. History Depth
≤1250 20000
2001 12488
4001 6247
8.001 3124
16.001 1562
32.001 781
The scaling of the time axis (y-axis) is not configurable. However, you can enlarge the
spectrogram display by maximizing the window using the "Split/Maximize" key.
Frame analysis - Frame count vs. sweep count
As described for standard spectrum sweeps, the sweep count defines how many
sweeps are analyzed to create a single trace. Thus, for a trace in "Average" mode, for
example, a sweep count of 10 means that 10 sweeps are averaged to create a single
trace, or frame.
The frame count, on the other hand, determines how many frames are plotted during a
single sweep measurement (as opposed to a continuous sweep). For a frame count of
2, for example, 2 frames will be plotted during each single sweep. For continuous
Trace Configuration

R&S FSW Series Specifications

General

Brand	R&S
Model	FSW Series
Category	Measuring Instruments
Language	English