VNA GUI Reference
R&S
®
ZNL/ZNLE
383
User Manual 1178.5966.02 ─ 07
Background information
Refer to the following sections:
●
Chapter 8.2.3, "Trace Formats"
●
Chapter 8.2.3.3, "Measured Quantities and Trace Formats"
dB Mag
Selects a Cartesian diagram with a dB scale of the vertical axis to display the magni-
tude of the complex measured quantity.
Properties:
The stimulus variable appears on the horizontal axis, scaled linearly. The
magnitude of the complex quantity C, i.e. |C| = sqrt ( Re(C)
2
+ Im(C)
2
), appears on the
vertical axis, scaled in dB. The decibel conversion is calculated according to dB
Mag(C) = 20 * log(|C|) dB.
Application:
dB Mag is the default format for the complex, dimensionless S-parame-
ters. The dB-scale is the natural scale for measurements related to power ratios (inser-
tion loss, gain etc.).
Tip (alternative formats):
The magnitude of each complex quantity can be displayed
on a linear scale. It is possible to view the real and imaginary parts instead of the mag-
nitude and phase. Both the magnitude and phase are displayed in the polar diagram.
Remote command:
MLOGarithmic
Phase
Selects a Cartesian diagram with a linear vertical axis to display the phase of a com-
plex measured quantity in the range between –180 degrees and +180 degrees.
Properties:
The stimulus variable appears on the horizontal axis, scaled linearly. The
phase of the complex quantity C, i.e. φ (C) = arctan ( Im(C) / Re(C) ), appears on the
vertical axis. φ (C) is measured relative to the phase at the start of the sweep (refer-
ence phase = 0°). If φ (C) e180° the curve jumps by –360°; if it falls below –
180°, the trace jumps by +360°. The result is a trace with a typical sawtooth shape.
The alternative "Unwr Phase" format avoids this behavior.
Format Softtool
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