R&S FSH
Spectrum Analyzer Mode
Performing Spectrum Measurements
Operating Manual 1173.6275.12 - 30
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3.1.6 Measuring the Spectrum Emission Mask
The Spectrum Emission Mask (SEM) measurement is a method to detect spurious
emissions or intermodulation products of a signal. When performing a SEM
measurement, the R&S FSH checks the signal against a spectral mask to see whether
the signal complies with a specific standard or not. Therefore, the R&S FSH provides
predefined spectrum emission masks for various telecomunications standards.
However, you can define your own spectral masks with the R&S FSH4View software to
perform measurements in frequency ranges other than the predefined ones. To learn
how to define Spectrum Emission Masks, refer to the R&S FSH4View manual.
► Press the MEAS key.
► Press the "Meas Mode" softkey.
The R&S FSH opens the measurement menu.
► Select the "Spectrum Emission Mask" menu item.
The R&S FSH starts to measure the spectrum emission mask.
Note that the frequency range of the actual measurement depends on the start and
stop frequency you have set on the R&S FSH. Correct measurement results are
therefore only possible if the frequency ranges of the SEM are inside the current span
of the R&S FSH.
Screen Layout for the SEM measurement
1
Standard
2
Marker information
3
SEM list
4
Limit check result
5
Spectrum emission mask (red line)
6
Trace (yellow line)
7
Peak (P<x>) and normal markers (M<x> and D<x>) (blue line)
8
SEM softkey menu
