Rohde & Schwarz FSW26 - Spectrum Emission Mask (SEM) Measurement; About the Measurement

Measurements
R&S
®
FSW
194User Manual 1173.9411.02 ─ 19
1.
Preset the R&S FSW.
2. Set the center frequency to 800 MHz.
3. Set the reference level to -10 dBm.
4. Select the "OBW" measurement function from the "Select Measurement" dialog
box.
5. Set the percentage of power to 99%.
6.
Set the channel bandwidth to 21
kHz as specified by the PDC standard.
7. Optimize the settings for the selected channel configuration by selecting "Adjust
Settings".
8. Adjust the reference level to the measured total power by selecting the "Auto
Level" softkey in the AUTO SET menu.
9. The PDC standard requires the peak detector for OBW measurement. In the
"Traces" configuration dialog, set the trace detector to "Positive Peak".
10. Start a sweep.
The result is displayed as OBW in the marker results.
5.6 Spectrum Emission Mask (SEM) Measurement
The R&S FSW supports Spectrum Emission Mask (SEM) measurements.
● About the Measurement........................................................................................194
● Typical Applications.............................................................................................. 195
● SEM Results......................................................................................................... 195
● SEM Basics...........................................................................................................198
● SEM Configuration................................................................................................208
● How to Perform a Spectrum Emission Mask Measurement..................................225
● Measurement Example: Multi-SEM Measurement................................................230
● Reference: SEM File Descriptions........................................................................ 231
5.6.1 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 FSW 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 may include gaps or overlap, and define
separate masks. Radio signals using multiple standards can also be analyzed.
Spectrum Emission Mask (SEM) Measurement