R&S FSL Cable TV Measurements (Option K20)
1300.2519.12 2.75 E-11
The result of the measurement is shown below.
Fig. 2-53 Digital TV Overview measurement
8. To form the average over a defined number of sweeps:
Press the TRACE key.
Press the Result Mode softkey and select the Average trace mode.
Press the Sweep Count softkey and enter the number of sweeps used for averaging.
Every result parameter in the table is averaged by a suitable averaging method over the
number of sweeps set.
Constellation Diagram measurement (modulation analysis)
This measurement displays the constellation diagram of the demodulated signal. Amplitude imbalance,
quadrature error and carrier leakage (see. Modulation Errors measurement (modulation analysis)) are
still present in the used data. The probability of occurrence of points in the complex I/Q plane is
represented by different colors. The constellation results are provided only graphically, i.e. reading
results via remote control returns only a hardcopy of the display, but not a list of I/Q samples.
Test setup:
Refer to the section Digital TV test setup.
Procedure:
1. Press the MEAS key.
2. Press the Digital TV softkey.
3. Press the Modulation Analysis softkey.
4. Press the Const Diagram softkey.
5. To zoom in on one single quadrant, press the Zoom softkey and choose the desired quadrant. To
go back to the complete constellation, select None.
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