R&S FSL Cable TV Measurements (Option K20)
1300.2519.12 4.235 E-11
Same as Meas Channel
Sets the active measurement channel as reference channel. If the active measurement channel
is changed, e.g. via the Channel No softkey, the reference channel is also changed
automatically. This is the default setting.
Remote: ATV:CN:POW:REF:MODE MCH
Remote: ATV:CSO:POW:REF:MODE MCH
Remote: ATV:CTB:POW:REF:MODE MCH
Manual Reference Power
Opens an edit dialog box to enter the reference power. The unit is set via the Unit softkey in the
amplitude menu.
Remote: ATV:CN:POW:REF:MAN 10
Remote: ATV:CSO:POW:REF:MAN 20
Remote: ATV:CTB:POW:REF:MAN 10
C/N Setup
Opens the C/N Setup dialog box to configure the following:
– Measurement Method
In–Service: While an analog TV signal is present, a gap between two consecutive channels,
where only noise exists, is used to determine the noise power. A noise marker is placed there,
and the noise power is determined.
Off–Service: The current measurement channel has to be switched off. An according message
prompts you to do so. In this channel, a noise marker is placed, and the noise power is
determined.
Quiet Line: While an analog TV signal is present, the carrier–to–noise ratio is measured using
the so–called "Quiet Line''. The measurement is fully automated.
– Measurement Frequencies
The table contains center frequencies (CF) and span values. The center frequency values are
relative to the vision carrier frequency. One parameter set defines a frequency span and is
used in one measurement. Only selected parameter sets are used in the measurements. If no
parameter set is selected at all, the measurement is performed over all listed parameter sets.
For the Quiet Line measurement method, the table remains empty. For the other measurement
methods, the table must contain at least one parameter set.
– Noise Reference Bandwidth
The entered value is multiplied with the measured noise power density to determine the noise
power value.
– Noise Floor Correction
This option activates or deactivates the noise correction factor measurement. By default, the
option is deactivated. In the noise correction factor measurement, the noise of the R&S FSL is
determined. Therefore you are prompted to remove the cable from the R&S FSL's RF input
when activating the option.
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