The Spectrum Application (RF Measurements)
R&S
®
FPL1000
402
User Manual 1178.3370.02 ─ 09
When active, the timestamp replaces the display of the frame number in the diagram
footer (see
Displaying individual frames
The spectrogram diagram contains all stored frames since it was last cleared. Arrows
on the left and right border of the spectrogram indicate the currently selected frame.
The spectrum diagram always displays the spectrum for the currently selected frame.
The current frame number is indicated in the diagram footer, or alternatively a time-
stamp, if activated. The current frame, displayed at the top of the diagram, is frame
number 0. Older frames further down in the diagram are indicated by a negative index,
e.g."-10". You can display the spectrum diagram of a previous frame by changing the
current frame number.
Markers in the Spectrogram
Markers and delta markers are shaped like diamonds in the spectrogram. They are
only displayed in the spectrogram if the marker position is inside the visible area of the
spectrogram. If more than two markers are active, the marker values are displayed in a
separate marker table.
Markers in three-dimensional spectrograms are slightly different and are described in
"Markers in three-dimensional spectrograms"
In the spectrum result display, the markers and their frequency and level values (1) are
displayed as usual. Additionally, the frame number is displayed to indicate the position
of the marker in time (2).
In the spectrogram result display, you can activate up to 16 markers or delta markers
at the same time. Each marker can be assigned to a different frame. Therefore, in
addition to the frequency you also define the frame number when activating a new
marker. If no frame number is specified, the marker is positioned on the currently
selected frame. All markers are visible that are positioned on a visible frame. Special
search functions are provided for spectrogram markers.
In the spectrum result display, only the markers positioned on the currently selected
frame are visible. In "Continuous Sweep" mode, this means that only markers posi-
tioned on frame 0 are visible. To view markers that are positioned on a frame other
than frame 0 in the spectrum result display, you must stop the measurement and select
the corresponding frame.
Three-Dimensional Spectrograms
A common spectrogram shows the frequency on the x-axis, while the y-axis shows the
time (in frames). The power level is indicated by different colors of the 2-dimensional
points.
Trace Configuration
