R&S
®
ZVL System Overview
Basic Concepts
Quick Start Guide 1303.6538.62-01 80
3.1.7 Display Formats and Diagram Types
A display format defines how the set of (complex) measurement points is converted
and displayed in a diagram. The display formats in the Trace – Format menu use the
following basic diagram types:
E Cartesian (rectangular) diagrams are used for all display formats involving a
conversion of the measurement data into a real (scalar) quantity, i.e. for dB Mag,
Phase, Group Delay, SWR, Lin Mag, Real, Imag and Unwrapped Phase.
E Polar diagrams are used for the display format Polar and show a complex quantity
as a vector in a single trace.
E Smith charts are used for the display format Smith and show vector like polar
diagrams but with grid lines of constant real and imaginary part of the impedance.
E Inverted Smith charts are used for the display format Inverted Smith and show
vector like polar diagrams but with grid lines of constant real and imaginary part of
the admittance.
Trace formats and measured quantities
The analyzer allows arbitrary combinations of display formats and measured quantities
(Trace – Meas). Nevertheless, in order to extract useful information from the data, it is
important to select a display format which is appropriate to the analysis of a particular
measured quantity; see Measured Quantities and Display Formats.
3.1.7.1 Cartesian Diagrams
Cartesian diagrams are rectangular diagrams used to display a scalar quantity as a
function of the stimulus variable (frequency).
E The stimulus variable appears on the horizontal axis (x-axis), scaled linearly
(sweep type Lin Frequency) or logarithmically (sweep type Log Frequency).
E The measured data (response values) appears on the vertical axis (y-axis). The
scale of the y-axis is linear with equidistant grid lines although the y-axis values
may be obtained from the measured data by non-linear conversions.
The following examples show the same trace in Cartesian diagrams with linear and
logarithmic x-axis scaling.
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