Cable and Antenna Test Mode
R&S
®
Cable Rider ZPH
119
User Manual 1321.0950.02 ─ 03
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.
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.
1. Press the FREQ/DIST key.
2. Select the "Start Dist" or "Stop Dist" softkey.
The R&S Cable Rider ZPH opens an input field to specify the start distance or stop
distance.
3. Enter the distance you want the display to start from and to end at.
In auto span mode, the R&S Cable Rider ZPH adjusts the frequency settings in
order to get the best display resolution.
If you have set the span manually, the R&S Cable Rider ZPH zooms in to the sec-
tion of the cable you have defined. The results maintain their accuracy in that case.
7.2.2.3
Setting the Frequency Range for CAT Measurements (except DTF)
If you measure the reflection, transmission or cable loss, the displayed frequency
range is defined by the span, the center frequency or start and stop frequencies.
Defining the span
The span you should select depends on the frequency band you are analyzing and the
frequency range you need information about.
The minimum span for both measurements is 10 Hz, the maximum span depends on
the R&S Cable Rider ZPH and is either 2.998 GHz or 3.998 GHz (R&S ZPH-B4
option).
1. Press the FREQ/DIST key.
Configuring Cable and Antenna Tests
