Instrument Function
R&S
®
SMBV100A
182Operating Manual 1176.8016.02 ─ 17
5.3.3.5 CCDF Display
The Complementary Cumulative Distribution Function shows the probability with which
the output signal will exceed the average power.
The level over the average power is plotted from 0 to 20 dB on the X axis; the average
power (RMS) corresponds to the origin. The probability of exceeding the average
power is plotted between 0.0001% and 100% on the Y axis. The recording depth is
8kSamples.
This signal is picked off at the output of the baseband main module ("Impairment" func-
tion block), i.e. contained in the displayed signal is:
●
impairment of the signal as defined by the user and the addition of noise.
5.3.3.6 Power Spectrum
With the spectrum display, the signal spectrum is calculated from the I/Q signal by
means of Fast Fourier Transform (FFT).
The power density over frequency is displayed. The power density is plotted on the Y
axis, and the frequency is plotted symmetrically on the X axis (-sampling rate/2 to
+sampling rate/2). FFT Points indicates the number of I/Q value pairs which are used
for calculating a (part-)FFT. AVG indicates the number of subspectra used for averag-
ing. The recording depth is 8kSamples.
Graphical Display - Graphics
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