Instrument Function
R&S
®
SMU200A
163Operating Manual 1007.9845.32 ─ 15
such as a change in modulation mode, or the effects of certain configurations, e.g. the
activation of several base stations in the case of (W)CDMA signals, can be analyzed
directly in the display. Freezing the signal and then zooming permit a detailed evaluation
of any signal segment. The definition and display of one or more reference curves makes
it possible to compare various signals (i.e. by comparing the CCDF (Complementary
Cumulative Distribution Function) with different channelization codes, or the spectra if
different filter parameters are selected).
An externally applied signal can be checked with respect to the anticipated signal char-
acteristics.
The displayed signal segment can be influenced by selecting the trigger that defines the
time for recording to start. With automatic triggering, the signal is tapped at the point in
the signal path that is best for the respective display. The displayed signal segment is
selected internally depending on the signal such that the signal characteristics of interest
(e.g. the useful signal) are displayed. This selection is appropriate for a representative
display of the complete signal.
In addition, a user-definable trigger is available with which the displayed signal segment
can be limited.
The time resolution can be set either automatically or manually, whereby for manual
setting the bandwidth for which the trace is to be displayed is selected. The transient
recorders used for signal recording have a variable recording depth which is specified
under the respective display.
In addition to the large graphics window, the display can also be shown in a small window
("smart graphics"). This window is fitted into the block diagram as a block, and can be
used for basic checking purposes (e.g. whether the signal is still being generated).
In the case of two-path instruments, the baseband signals of both paths can be displayed
simultaneously.
5.3.1 Graphics Settings Menu
The "Graphics Settings" menu for selecting the graphical display of the output signal is
opened either in the "Graphics" function block or in the menu with the same name which
is opened using the MENU key.
The signal display can be selected and activated in the menu.
With two-path instruments, the settings for the two paths can be entered separately. The
signals can be displayed simultaneously in two separate windows.
Graphical Display - Graphics
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