R&S ZVB - Page 200

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT GUI Reference
Trace Menu
Operating Manual 1145.1084.12 – 30 185
Smoothing On
Activates the smoothing function for the active trace, which may be a data or a memory trace. With active
smoothing function, each measurement point is replaced by the arithmetic mean value of all measurement
points located in a symmetric interval centered on the stimulus value. The width of the smoothing interval
is referred to as the Smoothing Aperture and can be adjusted according to the properties of the trace.
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 averaging out quick variations of the measured
values.
Remote control:
CALCulate<Chn>:SMOothing[:STATe] <Boolean>
Smoothing Aperture
Defines how many measurement points are averaged to smooth the trace if smoothing is switched on.
The Smoothing Aperture is entered as a percentage of the total sweep span.
An aperture of n % means that the smoothing interval for each sweep point i with stimulus value x
i
is equal
to [x
i
– span*n/200, x
i
+ span*n/200], and that the result of i is replaced by the arithmetic mean value of all
measurement points in this interval. The average is calculated for every measurement point. Smoothing
does not significantly increase the measurement time.
Finding the appropriate aperture
A large smoothing aperture enhances the smoothing effect but may also average out quick variations 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.
 As a general rule, the smoothing aperture should be 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 control:
CALCulate<Chn>:SMOothing:APERture <numeric_value>
Trace Data
Stores one or several data or memory traces to a file or loads a memory trace from a file. Import or export
is selected from a submenu: