Instrument Function
R&S
®
SMJ100A
179
Operating Manual 1403.7458.32 ─ 14
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.
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.
The spectrum display of the output signal is particularly suitable for checking multi car-
rier signals.
Graphical Display - Graphics
Summary of Contents for SMJ100A
Page 34: ...Preface R S SMJ100A 18 Operating Manual 1403 7458 32 14 Notes on Screenshots...
Page 86: ...Preparing for Use R S SMJ100A 70 Operating Manual 1403 7458 32 14 LXI Configuration...
Page 826: ...Remote Control Commands R S SMJ100A 810 Operating Manual 1403 7458 32 14 UNIT Subsystem...
Page 828: ...Maintenance R S SMJ100A 812 Operating Manual 1403 7458 32 14 Storing and Packing...
Page 844: ...Hardware Interfaces R S SMJ100A 828 Operating Manual 1403 7458 32 14 BERT Connector...
