GUI Reference
R&S
®
ZNA
346
User Manual 1178.6462.02 ─ 12
Tip:
The sweep average is an alternative method of compensating for random effects
on the trace by averaging consecutive traces. Compared to smoothing, the sweep
average requires a longer measurement time but does not have the drawback of aver-
aging out quick variations of the measured values.
See
Remote command:
CALCulate<Chn>:SMOothing[:STATe]
Aperture
Defines how many trace values are averaged to smooth the trace if
is
switched on.
An "Aperture" of
a
% means that the value at sweep point
n
∈
{1, ..., N}
is replaced by
the arithmetic mean of the values at sweep points
max { 1,
⌈
n – a/100·N/2
⌉
}, ..., min { N,
⌊
n + a/100·N/2
⌋
}
,
where
N
is the number of points of the sweep (or sweep segment for segmented
sweeps).
1
n
N
n – a/100·N/2
n + a/100·N/2
Length:
a/100·N
Smoothing interval
Midpoint
Sweep points inside the smoothing interval
The range definition above takes boder cases and rounding into account.
Tips:
Finding the appropriate aperture
A large smoothing aperture enhances the smoothing effect but can hide quick varia-
tions of the measured values and thus produce misleading results.
To avoid errors, observe the following recommendations.
●
Start with a small aperture and increase it only as long as you are certain that the
trace is still correctly reproduced.
●
Select a smoothing aperture that is small compared to the width of the observed
structures (e.g. the resonance peaks of a filter). If necessary, restrict the sweep
range or switch smoothing off to analyze narrow structures.
Remote command:
CALCulate<Chn>:SMOothing:APERture
Hold
Selects the "Max Hold" (peak hold) or "Min Hold" function for the active trace, or disa-
bles both functions ("Hold Off"). With enabled "Max Hold" or "Min Hold" function, the
displayed trace shows the maximum or minimum values that the analyzer acquired
since the start of the measurement. The "Max Hold" and "Min Hold" traces are real;
they are based on the magnitude of the trace values (the phase values are discarded).
Traces Softtool
