Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 238 / 813

Trace Menu R&S
®
ZVA/ZVB/ZVT
1145.1084.12 4.76 E-6
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<Ch/Tr>:SMOothing:APERture <numeric_value>
Import/Export 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: