Cable TV Measurements (Option K20) R&S FSL
1300.2519.12 4.220 E-11
Modulation Errors (Modulation Analysis) – digital TV
This measurement determines the modulation accuracy. The measurement results are displayed in a
table: Amplitude Imbalance (amplification difference of I and Q signal caused by a non–ideal IQ
modulator in the transmitter), Quadrature Error (phase offset relative to the ideal phase difference
b
etween the I and Q signal), Carrier Suppression, and Phase Jitter (root mean square of phase
error). The more important result parameters are displayed in the result table of the Overview – 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 Modulation Analysis softkey.
4. Press the Modulation Errors softkey.
5. To magnify one parameter, press the Zoom softkey and activate the parameter. To go back to the
default setting, activate None.
6. To change the limits, press the Edit Table softkey.
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".
Echo Pattern (Channel Analysis) – digital TV
This measurement determines the magnitude of the channel impulse response with respect to the
corresponding time delay. The following parameters can be set:
Parameter
channel number
unit
velocity factor
The basic procedure is the following:
1. Press the MEAS key.
2. Press the Digital TV softkey.
3. Press the Channel Analysis softkey.
4. Press the Echo Pattern softkey.
5. To change the unit from Ms to km or miles:
– Press the Velocity Factor softkey to define the velocity of propagation for the unit conversion.
– Press the Unit softkey to select the unit.
6. To zoom onto the echo pattern, press the Zoom softkey.
7. To adjust the input attenuator, press the Adjust Attenuation softkey.
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