Cable and Antenna Test Mode
R&S
®
ZNH
128
User Manual 1334.5985.02 ─ 02
Setting the displayed frequency range
After you have selected the span, you can set a particular frequency range which
results the R&S
ZNH displays.
In the default settings, the R&S
ZNH 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
ZNH opens an input field to specify the center frequency.
3. Enter the center frequency you require.
The R&S
ZNH adjusts the frequency range according to span and center fre-
quency.
4. Select the "DTF Start Freq" or the "DTF Stop Freq" softkey.
The R&S
ZNH 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
ZNH 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
ZNH adjusts the values if you enter a frequency range that is not the same as
the span.
Setting a dedicated DTF frequency
You can set a dedicated DTF frequency to be used in the DTF measurement. With this
setting, the DTF frequency remains 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 set 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.
Configuring Cable and Antenna Tests