Instrument Functions
R&S
®
FSVA/FSV
559Operating Manual 1176.7510.02 ─ 09
value range is to be visualized in greater detail than the rest, you can set the focus of
the color mapping to that area. Changing the focus is performed by changing the
shape of the color curve.
The color curve is a tool to shift the focus of the color distribution on the color map. By
default, the color curve is linear, i.e. the colors on the color map are distributed evenly.
If you shift the curve to the left or right, the distribution becomes non-linear. The slope
of the color curve increases or decreases. One end of the color palette then covers a
large amount of results, while the other end distributes several colors over a relatively
small result range.
You can use this feature to put the focus on a particular region in the diagram and to
be able to detect small variations of the signal.
Example:
Figure 3-49: Linear color curve shape = 0; colors are distributed evenly over the complete result
range
In the color map based on the linear color curve, the range from -105.5 dBm to -60
dBm is covered by blue and a few shades of green only. The range from -60 dBm to
-20 dBm is covered by red, yellow and a few shades of green.
Figure 3-50: Non-linear color curve shape = -0.5
After shifting the color curve to the left (negative value), more colors cover the range
from -105.5 dBm to -60 dBm (blue, green and yellow). The range from -60 dBm to -20
dBm on the other hand is dominated by various shades of red, but no other colors.
The color curve shape can be set numerically or graphically.
To set the color curve shape graphically using the slider
1. Tap the color map in the spectrogram display, or select the "Color Mapping" Soft-
key in the "Spectrogram" menu to display the "Color Mapping" dialog box.
2. Select and drag the color curve shape slider (indicated by a gray box in the middle
of the color curve) to the left or right. The area beneath the slider is focussed, i.e.
more colors are distributed there.
To set the color curve shape numerically
1. Tap the color map in the spectrogram display, or select the "Color Mapping" Soft-
key in the "Spectrogram" menu to display the "Color Mapping" dialog box.
2. In the "Shape" field, enter a value to change the shape of the curve:
● A negative value (-1 to <0) focusses the lower values
● 0 defines a linear distribution
Instrument Functions - Spectrogram Measurements
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