Cable and Antenna Test Mode
R&S
®
ZNH
119
User Manual 1334.5985.02 ─ 02
By default, the marker position is specified by the marker frequency and complex
resistance in
Ω
. The complex resistance in that case is calculated according to :
(real component) + j (imaginary component).
1. Select "Marker Mode" softkey.
The R&S
ZNH displays the marker mode submenu.
2. Select the marker format that you require.
The R&S
ZNH adjusts the marker information accordingly.
Selecting the reference impedance
The default reference impedance (the matching point in the center of the smith chart) is
50 Ω. It is, however, also possible to perform reflection measurements on networks
with another impedance.
1. Press [MARKER] key.
2. Select "Marker Mode" softkey.
The R&S
ZNH displays the marker mode submenu.
3. Select "Ref Impedance" menu item.
The R&S
ZNH opens an input field to select the reference impedance.
4. Enter the reference impedance you need.
7.1.6
Phase Measurement
The phase measurement shows the phase characteristics of the DUT in degrees. The
diagram is a Cartesian diagram with a linear vertical axis. The horizontal axis repre-
sents the measured frequency range.
In the default state, the R&S
ZNH shows the phase only from -200° to +200°. In that
case, the R&S
ZNH displays measurement results correctly only if the phase difference
between two adjacent test points is less than 180°.
You can unwrap the phase to expand the range of the phase.
1. Press [MEAS] key.
2. Select "Retrurn Loss" softkey.
The R&S
ZNH starts the reflection measurement with default measurement format
over its entire frequency range.
3. Press the [FORMAT] key.
4. Select "Phase" softkey.
The R&S
ZNH performs the phase measurement of the DUT.
5. Select the "Wrap" or "Unwrap" softkey.
6. For additional information display, select either "Electrical Length" or "Delay Time".
Performing Cable and Antenna Measurements