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Concepts and features
R&S
®
ZND
208
User Manual 1173.9557.02 ─ 61
The rectangular "No Profiling (Rectangle) "windows minimize numerical inaccuracies
near the boundaries of the measured frequency span. In the limit where the effect of
the time gate vanishes (e.g. a gate of type "Notch" and a very small width), the time
gated trace is equal to the original measured trace.
4.7.5.6
Time domain S
VSWR
measurements
The vector network analyzer R&S
ZND 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.
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.
Optional extensions and accessories
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Allice Messtechnik GmbH