Cable and Antenna Test Mode
R&S
®
Cable Rider ZPH
118
User Manual 1321.0950.02 ─ 03
●
Coupled
The frequency parameters are coupled with the
the maximum cable distance adjusted for the best resolution. This mode is useful
when you switch between the
measurements.
1. Press the FREQ/DIST key.
2. Select the "DTF Span" softkey.
The R&S Cable Rider ZPH opens a submenu to specify the frequency span.
By default, the R&S Cable Rider ZPH automatically calculates the best span ("Auto
Span") for the best length resolution. If the required span is too large for the current
center frequency, the R&S Cable Rider ZPH sets the center frequency to the small-
est possible frequency.
3. Select the "Manual Span" menu item.
The R&S Cable Rider ZPH opens an input field to specify the frequency span.
4. Enter the span you require.
The R&S Cable Rider ZPH sets the new span. Note that the maximum span you
can set depends on the maximum cable distance you have defined and is never
greater than the span calculated by the "Auto Span" function. The minimum span
that you can set is 10 MHz.
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.
Configuring Cable and Antenna Tests
