GUI Reference
R&S
®
ZNB/ZNBT
439
User Manual 1173.9163.02 ─ 38
Cartesian diagram areas are used for transmission S-parameters, Cartesian or
Smith diagrams for reflection parameters. The selections to be made depend on
the test setup selected in the previous stage.
Tip:
In case of an error in a previous stage, you can always use the "Back" button
and correct your settings.
4.
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 fre-
quency and span). The measurement points are equidistant across the sweep
range. Increasing the number of points also increases the measurement time per
single sweep.
5.
Select the measurement bandwidth and source power
Choose a typical measurement bandwidth and one of three 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 ana-
lyzer from being overdriven, especially if an active DUT with high gain is measured.
Note:
The predefined bandwidths and source powers have been selected according to
the following criteria:
● The large measurement bandwidth ("Fast Sweep") ensures that the noise of an
S
21
trace at minimum source power and 0 dB attenuation is smaller than 0.1
dB.
● The default source power for a passive DUT ensures that the analyzer receiver
is in its linear range (no compression) if a passive DUT with 0 dB attenuation is
measured. The default source powers for active DUTs ensure no compression
if an active DUT with 20 dB or 40 dB gain is measured. If the actual gain of the
DUT is more than 50 dB, then the default source power of –40 dB is still too
high and needs to be changed after finishing the wizard.
6.
Perform a calibration (optional)
Call the calibration wizard and perform a calibration. The default calibration is a full
n-port (TOSM) calibration, where n is the number of test ports selected in the first
stage of the calibration wizard. Automatic calibration is also possible (if a calibra-
tion unit is available).
Tip:
You can skip the calibration step (select "Finish now without Calibration") if one of
the following applies:
● A valid calibration is already assigned to the active channel
● You want to apply a valid calibration stored in the cal pool.
● You do not want to use a calibration, e.g. because the factory calibration is
accurate enough for your measurement.
Meas Softtool
