Technical data

Chapter 16 457
Spectrum Analyzer
Using the Spectrum Emission Mask Measurement
Spectrum Analyzer
• Averaging mode set to
—
Running for CDMA and 1xEVDO channel standards
—
Group Average for W-CDMA channel standard
• If currently selected channel standard is
Band class 0, 2, 3, 5, 7, 9 or 10 (see
table above)
—
Span set to 8MHz
• If currently selected channel standard is Band class 1, 4, 6 or 8
— Span set to 5MHz
• Upper limits are set to the levels specified in the table above.
The SEM Measurement is turned
Off when either the Occupied Bandwidth or
Interference Analysis measurements are turned
On.
NOTE The SEM standards for W-CDMA signals specify different RBW settings at
different frequency offsets (see “W-CDMA UTRA Channel Frequencies and
Emission Limits” on page 453). This requires your base station test set to build up
the W-CDMA SEM trace from several discrete segments, and can make the test set
appear slow. The progress of your W-CDMA SEM measurement is indicated by the
following status messages:
• Measuring SEM Outer Segments...
• Measuring SEM Inner Segments...
• Measuring reference Channel...
Note also that if you have Noise Correction switched On, your test instrument needs
to take two sweeps for every update. This will make your test intrument cycle
through the three progress messages (above) twice before the screen is updated.