Spectrum Emission Mask Measurements - Keysight X Series Measurement Manual

Spectrum Emission Mask Measurements

This section explains how to make the spectrum emission mask measurement on a
W-CDMA (3GPP) mobile station. (A signal generator is used to simulate a mobile
station.) SEM compares the total power level within the defined carrier bandwidth
and the given offset channels on both sides of the carrier frequency, to levels allowed
by the standard. Results of the measurement of each offset segment can be viewed
separately.
Step
1 Set up the signal source.
2 Connect the source RF
OUTPUT to the analyzer
RF INPUT as shown.
3 Select the mode.
4 Preset the analyzer.
5 Set the radio standard
and toggle the device to
mobile station.
6 Set the center frequency.
Action
a. Setup a W-CDMA uplink
signal.
b. Set the source frequency to
1,920 MHz (Channel.
Number: 5 × 1,920 = 9,600).
c. Set the source amplitudes
to 0 dBm.
• Press Mode, Spectrum
Analyzer.
• Press Mode Preset.
• Press Mode Setup, Radio
Std, 3GPP W-CDMA,
3GPP W-CDMA, Device
(MS).
• Press FREQ Channel,
1.920, GHz.
135
Measuring Digital Communications Signals
Spectrum Emission Mask Measurements
Notes