Common Measurement Settings
R&S
®
FSVA3000/ R&S
®
FSV3000
366
User Manual 1178.8520.02 ─ 01
Enter a manual or relative value, or set the step size to the current center fre-
quency or marker value. To move from one harmonic to the next, use the center
frequency or marker value.
2. Select the "Center Frequency" dialog field.
3. Use the arrow keys to move the center frequency in discrete steps through the
available frequency range.
8.4
Amplitude and Vertical Axis Configuration
In the Spectrum application, measurement results usually consist of the measured sig-
nal levels (amplitudes) displayed on the vertical (y-)axis for the determined frequency
spectrum or for the measurement time (horizontal, x-axis). The settings for the vertical
axis, regarding amplitude and scaling, are described here.
Impact of the Vertical Axis Settings
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How to Optimize the Amplitude Display
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8.4.1
Impact of the Vertical Axis Settings
Some background knowledge on the impact of the described settings is provided here
for a better understanding of the required configuration.
8.4.1.1
Reference Level
The reference level value is the maximum value the AD converter can handle without
distortion of the measured value. Signal levels above this value will not be measured
correctly, which is indicated by the "IF Overload" status display.
Internally, the reference level is also used to determine the optimum hardware settings
for the R&S
FSV/A. The defined reference level should correspond with the maximum
expected RF input level.
When determining the expected input level, consider that the power from
all
input sig-
nals contribute to the total power. The reference level must be higher than the total
power from all signals.
The optimum reference level for the current measurement settings can be set automat-
ically by the R&S
FSV/A (see
Amplitude and Vertical Axis Configuration