Rohde & Schwarz FSH4, Руководство по эксплуатации

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R&S FSH Spectrum Analyzer Mode
Performing Spectrum Measurements
Operating Manual 1309.6275.12 - 14 72
The best way to display a spectrogram is therefore to reduce the level range until
the lowest signal part is mapped to the lower end of the color map and the highest
signal part to the upper end of the color map.
In a last step you can configure the spectrogram in a way that it only shows signal
peaks in color and the noise floor in black. To get a result like that you have to
reduce the level range, until the noise floor is outside the displayed range.
M Instead of entering a level range of 40 dB, enter a level range of 35 dB or even
30 dB.
This will provide a high contrast between signal parts that are above the noise
floor, and the noise floor, which is drawn in black.
To show details of the noise floor
and exclude the peak levels you
have to lower the spectrogram
reference level, until it is just
above the noise floor. The
R&S FSH will then display the
signal parts that are above the
reference level in only one color,
which is the color at the upper
border of the color map.
2.1.8.4 Recording a Spectrogram
You can save the data of the spectrogram for documentation or for further analysis of
the recorded data.
M Press the MEAS key.
M Press the "Save Spectrogram" softkey.
The R&S FSH opens a dialog box
to save the current spectrogram.
M Enter the name of the spectrogram
with the alphanumeric keys.
By default, the R&S FSH saves
the spectrogram as
'Spectrogram###' with ascending
numbers.
M Press the "Save" softkey to store
the spectrogram.
Now that you have saved the spectrogram, you can replay it any time you want.
The number of spectrograms that you can store on the R&S FSH internal memory
depends on the other datasets that are currently on the R&S FSH.