122
Measuring Digital Communications Signals
Making Statistical Power Measurements (CCDF)
5 Set the analyzer radio
mode to W-CDMA as a
base station device.
• Press Mode Setup, Radio
Std, 3GPP W-CDMA,
3GPP W-CDMA, Device
(BTS).
6 Set the center frequency. • Press FREQ Channel, 1.98,
GHz
7 Select the CCDF
measurement and
optimize the attenuation
level and attenuation
settings suitable for the
CCDF measurement.
a. Press Meas, Power Stat
CCDF.
b. Press AMPTD,
Attenuation, Adjust Atten
for Min Clip.
Figure 9-6 Power Statistics CCDF Measurement on a W-CDMA Signal
8 Store your current
measurement trace for
future reference.
• Press Trace/Detector, Store
Ref Trace.
When the power stat CCDF
measurement is first made, the
graphical display should show a signal
typical of pure noise. This is labeled
Gaussian, and is shown in aqua. Your
CCDF measurement is displayed as a
yellow plot. You have stored this
measurement plot to make for easy
comparison with subsequent
measurements. Refer to Figure 9-6.
Step Action Notes
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