R&S FSH
Getting Started
Using the Spectrum Analyzer
Quick Start Guide 1309.6269.12 - 09
57
2.1.4
Measuring Harmonics
A spectrum analyzer is ideal to measure harmonic levels or harmonic ratios, because it
can resolve different signals in the frequency domain.
With marker functions, you can speed up measurement tasks like that.
A signal generator, e.g. R&S SMBV provides the signal source.
Test setup
Connect the RF output of the signal generator to the RF input of the R&S FSH.
Signal generator settings:
Frequency:
100 MHz
Level:
-20 dBm
Detecting harmonics
► Press the PRESET key.
The R&S FSH is reset to its default state.
After the preset, the R&S FSH displays the frequency spectrum over its full frequency
span. At 700 MHz, the generator signal is displayed as a vertical line.
In addition you can see the harmonics as smaller vertical lines at frequencies that are
multiples of 100 MHz.
To measure the second harmonic ratio, decrease the span.
► Press the FREQ key.
► Press the "Start Freq" softkey.
► Enter a start frequency of 50 MHz
► Press the "Stop Freq" softkey.
► Enter a stop frequency of 250 MHz.
The R&S FSH displays the frequency spectrum in the range from 50 MHz to
250 MHz. This frequency range visualizes the signal itself at 100 MHz and the
second harmonic at 200 MHz.
