R&S FSVA3000 Series, User Manual

Page: 206 / 1268

Measurements and Results
R&S
®
FSVA3000/ R&S
®
FSV3000
206 User Manual 1178.8520.02 ─ 01
12. Start a sweep.
The result is displayed as OBW in the marker results.
7.6 Spectrum Emission Mask (SEM) Measurement
Spectrum Emission Mask (SEM) measurements monitor compliance with a spectral
mask.
● About the Measurement ........................................................................................206
● Typical Applications ...............................................................................................206
● SEM Results ......................................................................................................... 207
● SEM Basics ...........................................................................................................210
● SEM Configuration ................................................................................................220
● How to Perform a Spectrum Emission Mask Measurement ..................................237
● Measurement Example: Multi-SEM Measurement ................................................242
● Reference: SEM File Descriptions ........................................................................ 244
7.6.1 About the Measurement
The Spectrum Emission Mask (SEM) measurement defines a measurement that moni-
tors compliance with a spectral mask. The mask is defined with reference to the input
signal power. The R&S
FSV/A allows for a flexible definition of all parameters in the
SEM measurement. The analyzer performs measurements in predefined frequency
ranges with settings that can be specified individually for each of these ranges.
In the basic Spectrum application, spectrum emissions can be measured for multiple
sub blocks of channels, where the sub blocks can include gaps or overlap, and define
separate masks. Radio signals using multiple standards can also be analyzed.
SEM measurement configurations can be saved to an XML file which can then be
exported to another application or loaded on the R&S
FSV/A again later. Some prede-
fined XML files are provided that contain ranges and parameters according to the
selected standard.
To improve the performance of the R&S FSV/A for spectrum emission mask measure-
ments, a "Fast SEM" mode is available.
A special limit check for SEM measurements allows for monitoring compliance of the
spectrum.
7.6.2 Typical Applications
Spectrum Emission Mask measurements are typically performed to ensure that modu-
lated signals remain within the valid signal level ranges. These ranges are defined by a
particular transmission standard, both in the transmission channel and neighboring
channels. Any violations of the mask can interfere with other transmissions.
Spectrum Emission Mask (SEM) Measurement