Ronde & Schwarz 1304.0004K03, User Manual

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The Spectrum Application (RF Measurements)
R&S
®
FPL1000
310 User Manual 1178.3370.02 ─ 11
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.
6.5 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.
"Auto Settings" are described in Chapter 6.8, "Adjusting Settings Automatically" ,
on page 346.
● Impact of the Vertical Axis Settings .......................................................................310
● Amplitude Settings ................................................................................................ 313
● Scaling the Y-Axis ................................................................................................. 316
● How to Optimize the Amplitude Display ................................................................318
6.5.1 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.
● Reference Level ....................................................................................................310
● RF Attenuation ...................................................................................................... 312
● Scaling .................................................................................................................. 312
6.5.1.1 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
FPL1000. The defined reference level should correspond with the maxi-
mum 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.
Amplitude and Vertical Axis Configuration