Cable TV Measurements (Option K20) R&S FSL
1300.2519.12 2.80 E-11
Fig. 2-57 Digital TV Channel Power measurement
APD measurement
This measurement determines the amplitude probability density function (APD). The measurement can
also be performed in Spectrum Analyzer mode, but in the Cable TV Analyzer mode most of the
parameters are set automatically. For details on the background refer to section Amplitude Distribution
Measurements.
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 More softkey.
4. Press the APD softkey.
5. To change the scaling parameters of the x– and y–axis:
Press the Scaling softkey.
Press the corresponding softkey to change the parameters: x–Axis Signal Level, x–Axis Range,
y–Axis Max. Value, y–Axis Min. Value, Default Settings.
6. To adjust the input attenuator, press the Adjust Attenuation softkey.
7. Press the RUN key.
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