Note that it might take a little while to access a new file during spectrogram playback (a
corresponding message is shown).
Configuring Long Time Spectrograms
You can define several characteristics of the long time spectrogram in the “Measure
Setup” menu:
● Recording Mode: Selects the way the spectrogram is controlled.
- “Timer”: Recording starts and stops on a certain date and time. You can define
the date via the “Start / Stop Date” and “Start / Stop Time” menu items (for
example from 6:00 am to 6:00 pm on January 1st in the year 3000. You can
also define a “Duration” instead of specifying a stop time.
- “Immediately”: Recording begins immediately, and you can define a “Duration”
(for example 6 hours). Otherwise the recording stops when you deliberately so.
- “Limits Failure”: Recording starts or stops when a limit has been violated.
Select the details with the “Limits Save Mode” menu item.
In any case, you can stop the recording deliberately any time by turning the
long time spectrogram off.
- “Stop Recording If Battery Low”: Recording stops when the battery level runs
low.
● Recording Speed: Selects if the spectrogram measurement time is defined
automatically by the R&S FSH or manually. In the latter case, define the
measurement time with the “Manual Recording Interval” menu item (Example: a
spectrogram line is added every 100 ms).
Analyzing Long Time Spectrograms with the R&S FSH4View software
Long spectrograms can be difficult to read on the R&S FSH. However, the
R&S FSH4View software package provides a tool called the "Long Time Recording
Viewer" that allows you to conveniently display and analyze very long spectrograms.
► Select the icon in the toolbar of the R&S FSH4View software to open the
viewer.
In the viewer, you can do several things.
● Display spectrograms that you have previously saved via the "File" menu. The
compressed view shows the complete spectrogram, while the main window shows
a detailed view of the measured data.
● Apply different color schemes via the "Colors" menu. The color schemes are the
same as those available within the firmware.
● Select a certain time line in the spectrogram and view the corresponding spectrum
in the diagram area below the spectrogram.
● Zoom into and out of the measurement results.
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