Instrument Functions
R&S
®
FSVA/FSV
557Operating Manual 1176.7510.02 ─ 09
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Hot
Uses a color range from blue to red. Blue colors indicate low levels, red colors indi-
cate high ones.
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Cold
Uses a color range from red to blue. Red colors indicate low levels, blue colors
indicate high ones.
The "Cold" color scheme is the inverse "Hot" color scheme.
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Radar
Uses a color range from black over green to light turquoise with shades of green in
between. Dark colors indicate low levels, light colors indicate high ones.
●
Grayscale
Shows the results in shades of gray. Dark gray indicates low levels, light gray indi-
cates high ones.
To select a color scheme
1. Tap the color map in the spectrogram display, or select the "Color Mapping" Soft-
key in the "Spectrogram" menu.
2. In the "Color Mapping" dialog box, select the option for the color scheme to be
used.
3.10.3.2 Defining the Value Range of the Color Map
If the measured values only cover a small area in the spectrogram, you can optimize
the displayed value range so it becomes easier to distinguish between values that are
close together, and only parts of interest are displayed at all.
The distribution of the measured values is displayed as a histogram in the "Color Map-
ping" dialog box (see Figure 3-51). To cover the entire measurement value range,
make sure the first and last bar of the histogram are included. To remove noise from
the display, exclude the bottom 10 or 20 dB of the histogram.
The value range of the color map must cover at least 10% of the value range on the
horizontal axis of the diagram.
The value range can be set numerically or graphically.
Instrument Functions - Spectrogram Measurements
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