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Concepts and Features
R&S
®
ZNA
192
User Manual 1178.6462.02 ─ 12
5.7.2.6
Time Domain S
VSWR
Measurements
The vector network analyzer R&S
ZNA with time domain option K2 supports TD site
VSWR measurements.
For the frequency range 1
GHz to 18
GHz, this method of S
VSWR
measurement is pro-
posed in standard ANSI
C63.25.
Hence a R&S
ZNA equipped with time domain option K2 supports TD site VSWR mea-
surements in accordance with ANSI C63.25.
EMC Test Site Validation
EMC test sites for radiated emission measurements rely on free-space conditions to
minimize the influence of reflections on the received signal. Practically, near free-space
conditions are achieved by shielded enclosures fully lined with RF absorbing material.
Site validation
determines deviations from free-space conditions that must meet the
acceptance criterion for making EMC compliance measurements in a FAR (= fully
anechoic room). It is performed by measuring the
site voltage standing-wave ratio
(S
VSWR
), which is the ratio of maximum received signal to minimum received signal,
caused by interference between direct (intended) and reflected signals.
blue arrow
= direct signal
red and green arrows = reflected signal
Optional Extensions and Accessories