Common Analysis and Display Functions
R&S
®
FSW
459User Manual 1173.9411.02 ─ 19
Fig. 7-7: Screen layout of the spectrogram result display
1 = Spectrum result display
2 = Spectrogram result display
3 = Current frame indicator
4 = Timestamp / frame number
5 = Color map
6 = Marker
7 = Delta marker
8 = Marker list
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 sweeps 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 chapter 7.3.1.1, "Mapping Samples to Sweep Points with the Trace Detector",
on page 452).
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 sweep measurements unless they are cleared manually.
The maximum number of frames that you can capture is summarized in table 7-3.
Table 7-3: Correlation between number of sweep points and number of frames stored in the history
buffer
Sweep Points Max. History Depth
≤1250
20000
2001 12488
Trace Configuration
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