R&S ZVL
GUI Reference
Trace Menu
Operating Manual 1303.6580.32-06
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used for transmission S-parameters, Cartesian or Smith diagrams for reflection parameters.
Select the sweep settings
Choose the frequency range and the number of measurement points per sweep. The sweep
range is defined by two values (start and stop frequency or center frequency and span). The
measurement points are equidistant across the sweep range. Increasing the number of points
also increases the measurement time per single sweep.
Select the measurement bandwidth and source power
Choose a typical measurement bandwidth and one of two typical source power values. A smaller
measurement bandwidth increases the dynamic range but slows down the measurement. A
smaller source power protects the input port of the analyzer from being overdriven, if an active
DUT with high gain is measured.
Perform a calibration (optional)
Call up the calibration wizard and perform a calibration. The calibration type is a full 2-port
(TOSM) calibration. This calibration can be performed as well using automatic calibration (if
accessory R&S ZV-Z5x, Calibration Unit, is available).
You can skip the automatic calibration stage (select
Finish without Calibration)
if
•
A valid calibration is already assigned to the active channel
•
You want to apply a valid calibration stored in the cal pool
•
You want to perform the calibration manually, e.g. because you wish to select another
calibration type.
•
You don't want to use a calibration, e.g. because the factory calibration is accurate
enough for your measurement.
In order to obtain a predictable result the measurement wizard has to reset all settings except the
current calibration data. Store your setup if you don't want to lose the current configuration.
Distance-to-Fault
Opens a submenu to locate faults and discontinuities on cables. The measurement requires option ZVL-
K2 ,
Distance-to-Fault.
Distance-to-fault measurement
The network analyzer measures and displays complex S-parameters and other quantities as a function of
the frequency. The measurement results can be filtered and mathematically transformed in order to obtain
the
impulse response
, which often gives a clearer insight into the characteristics of the DUT.
The impulse response is special type of a time-domain representation. A fault (discontinuity) on a
transmission line causing reflection results in a spike on the impulse response trace of the reflection
coefficient. The distance between the reference plane and the fault can be calculated from the
propagation time, taking into account the electrical properties of the transmission line
(Cable Type).
The
following example shows the reflection at the end of an open cable with a length of approx. 959 mm (Mkr
2 position). The cable is connected to the test port no. 2 of the analyzer. A full one-port calibration ensures
that the distance is measured from the test port position (reference plane = distance zero). The additional
peak at the position of Mkr 1 is due to the connection between the cable and the test port.
