Cable and Antenna Test Mode
R&S
®
Cable Rider ZPH
148
User Manual 1321.0950.02 ─ 07
Setting the displayed frequency range
After you have selected the span, you can set a particular frequency range whose
results the R&S Cable Rider ZPH displays.
In the default configuration, the R&S Cable Rider ZPH adjusts the "DTF start" and
"DTF stop" frequency according to the span and the center frequency. The distance
from center frequency to the start and stop frequency is the same. Alternatively, you
can directly set a "DTF start" and "DTF stop" frequency.
1. Press the [FREQ/DIST] key.
2. Select the "DTF Center Freq" softkey.
The R&S Cable Rider ZPH opens an input field to specify the center frequency.
3. Enter the center frequency you require.
The R&S Cable Rider ZPH adjusts the frequency range according to span and
center frequency.
4. Select the "DTF Start Freq" or the "DTF Stop Freq" softkey.
The R&S Cable Rider ZPH opens an input field to specify the start frequency or
stop frequency.
5. Enter the start frequency or stop frequency you require.
The R&S Cable Rider ZPH adjusts the frequency range according to your settings.
Note that the distance from start to stop frequency has to be equal to the span. The
R&S Cable Rider ZPH adjusts the values if you enter a frequency range that is not
the same as the span.
Setting a dedicated DTF frequency
You can configure a dedicated DTF frequency to be used in the DTF measurement.
With this configuration, the DTF frequency setting will remain unchange when there is
a frequency change in other measurements in the CAT mode.
1. Press the [SETUP] key.
2. Select the "User Preference" softkey.
3. Select the "Dedicated DTF Frequency" item.
A drop- down menu opens to select the dedicated DTF frequency setting.
4. Select "On" to configure a dedicated DTF frequency.
See
"Dedicated DTF frequency"
on page 147.
7.2.2.2
Setting the Start and Stop Distance for DTF Measurements
The start and stop distance define the scaling of the horizontal axis.
In the default setting, the horizontal axis start at 0 m and covers the maximum or stop
distance you have set. By adjusting the start and stop distance, you can zoom in to a
particular section of the cable for further analysis.
Configuring Cable and Antenna Tests
