Cable TV Measurements (Option K20) R&S FSL
1300.2519.12 2.62 E-11
Fig. 2-41 CSO Off–Service measurement
The lower pane shows the final C/N ratio and whether it is passed or failed. It also shows the most
important correction factors used to calculate the CSO ratio. The Off–Service mode is the most
accurate way to measure CSO, but you must turn off the active channel.
CSO Quiet Line measurement
Test setup:
Refer to the section Analog TV test setup.
Procedure:
1. Press the SWEEP key.
2. Press the Single Sweep softkey.
3. Press the FREQ key.
4. Enter 210.25 MHz for the vision carrier frequency of the input signal.
5. Press the MEAS key.
6. Press the Analog TV softkey.
7. Press the CSO softkey.
8. To change the limits, press the Edit Table softkey.
9. To adjust the input attenuator, press the Adjust Attenuation softkey.
10. Press the CSO Setup softkey to open the CSO Setup dialog box.
Make sure, that Quiet Line is chosen as measurement mode.
If desired, activate the Noise Floor Correction option.
11. Press the RUN key.
The R&S FSL will first measures the carrier power. This is not visible on the screen. In contrast to
the Off–Service mode, the R&S FSL will not ask you to turn off the signal in the measurement
channel. The spectrum of the noise and beats is measured by a gated FFT.
To Next Page
Loading...
