Rohde & Schwarz FSVA - 3.10.3.3 Defining the Shape and Focus of the Color Curve

Instrument Functions
R&S
®
FSVA/FSV
558Operating Manual 1176.7510.02 ─ 09
To set the value range graphically using the color range sliders
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 bottom color curve slider (indicated by a gray box at the left of
the color curve pane) to the lowest value you want to include in the color mapping.
3. Select and drag the top color curve slider (indicated by a gray box at the right of
the color curve pane) to the highest value you want to include in the color mapping.
To set the value range 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 "Start" field, enter the percentage from the left border of the histogram that
marks the beginning of the value range.
3. In the "Stop" field, enter the percentage from the right border of the histogram that
marks the end of the value range.
Example:
The color map starts at -100 dBm and ends at 0 dBm (i.e. a range of 100 dB). In order
to suppress the noise, you only want the color map to start at -90 dBm. Thus, you enter
10% in the "Start" field. The R&S FSVA/FSV shifts the start point 10% to the right, to
-90 dBm.
Adjusting the reference level and level range
Note that changing the reference level and level range of the measurement also affects
the color mapping in the spectrogram.
3.10.3.3 Defining the Shape and Focus of the Color Curve
The color mapping function assigns a specified color to a specified power level in the
spectrogram display. By default, colors on the color map are distributed evenly, i.e. the
color range is applied to the value range linearly. However, if a certain area of the
Instrument Functions - Spectrogram Measurements