GUI Reference
R&S
®
ZNC
171
User Manual 1173.9557.02 ─ 13
Smoothing
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 arith-
metic 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.
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 averaging out
quick variations of the measured values. See
chapter 4.4.1.3, "Power Bw Avg > Aver-
Remote command:
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.
Tips:
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.
Trace Settings