R&S FSL Cable TV Measurements (Option K20)
1300.2519.12 4.219 E-11
Overview – digital TV
This measurement determines the modulation accuracy of digitally modulated single carrier cable TV
signals. The measurement results are displayed in a table: MER (rms) for the root mean square of the
modulation error rate, MER (peak) for the peak of the modulation error rate, EVM (rms) for the root
m
ean square of the error vector magnitude, EVM (peak) for the peak of the error vector magnitude,
Carrier Frequency Offset, and Symbol Rate Offset. Less important result parameters are displayed
in the result table of the Modulation Errors (Modulation Analysis) – digital TV measurement. The
following parameters can be set:
Parameter
channel number
limits
The basic procedure is the following:
1. Press the MEAS key.
2. Press the Digital TV softkey.
3. Press the Overview softkey.
4. To magnify one parameter, press the Zoom softkey and activate the parameter. To go back to the
default setting, activate None.
5. To change the limits, press the Edit Table softkey.
6. To adjust the input attenuator, press the Adjust Attenuation softkey.
7. Press the RUN key.
For a more detailed description of this measurement type refer to chapter "Advanced Measurement
Examples".
Constellation Diagram (Modulation Analysis) – digital TV
This measurement displays the constellation diagram. The following parameters can be set:
Parameter
channel number
The basic procedure is the following:
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 into one quadrant, press the Zoom softkey and activate the parameter. To go back to the
general view, activate None.
6. To display the constellation diagram unchanged, while the I/Q samples are collected in the
background, press the Freeze softkey. To switch back to the continual update the display, press the
Freeze softkey again.
7. To adjust the input attenuator, press the Adjust Attenuation softkey.
8. Press the RUN key.
For a more detailed description of this measurement type refer to chapter "Advanced Measurement
Examples".
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