VNA concepts and features
R&S
®
ZNL/ZNLE
215
User Manual 1178.5966.02 ─ 19
9.2.3.3
Measured quantities and trace formats
The analyzer allows any combination of a display format and a measured quantity. The
following rules can help to avoid inappropriate formats and find the format that is ide-
ally suited to the measurement task.
●
All formats are suitable for the analysis of reflection coefficients S
ii
. The formats
"SWR", "Smith" and "Inv Smith" lose their original meaning (standing wave ratio,
normalized impedance or admittance) if they are used for transmission S-parame-
ters, ratios and other quantities.
●
For complex "Impedances", "Admittances", "Z-parameters", and "Y-parameters"
generally a Cartesian format or the polar format is suitable.
●
For the real valued
, one of the Cartesian formats "Lin Mag" or
"Real" should be used. In complex formats, real numbers represent complex num-
bers with zero imaginary part.
The following table gives an overview of recommended display formats.
Complex dimensionless quan-
tities:
S-parameters and ratios
Complex quantities with dimensions:
Wave quantities, Z-parameters, Y-
parameters, impedances, admittan-
ces
Real quantities:
Stability Factors
Lin Mag
ON
ON (default for Z-parameters, Y-param-
eters, impedances, admittances)
ON (default)
dB Mag
ON (default)
ON (default for wave quantities)
–
Phase
ON
ON
–
Real
ON
ON
ON
Imag
ON
ON
–
Unwrapped Phase
ON
ON
–
Smith
ON (reflection coefficients S
ii
)
–
–
Polar
ON
–
–
Inverted Smith
ON (reflection coefficients S
ii
)
–
–
SWR
ON (reflection coefficients S
ii
)
–
–
Delay
ON (transmission coefficients S
ij
)
–
–
The default formats are activated automatically when the measured quantity is
changed.
9.3
Measurement results
This section gives an overview of the measurement results of the network analyzer and
the meaning of the different measured quantities. All quantities can be selected in the
"Meas" softtool (function key [Meas]).
Measurement results
