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f) Measure the harmonic distortion (Method 1).
The fundamental wave and the second harmonic as shown in the figure has am amplitude difference of about -60
dB, or a harmonic distortion of 0.1% (see Fig. 4-17).
Fig. 4-17 Conversion of Percentage of Harmonic Distortion Amplitude
To measure the third harmonic, press [Next Pk Right] and read the amplitude ratio of other harmonics to the
fundamental wave.
g) Measure the harmonic distortion (Method 2).
Press [Amplitude], [Units] and [Volt].
In this case, the unit of the differential marker will automatically change into volt. An easy way to determine
distortion percentage is to change the unit to volt. Move the decimal of the proportion indicated by the differential
marker rights for two places to obtain the distortion percentage. The minimum ratio that can be displayed is 0.01 or
1%.
3) Accurate harmonic measurement
It takes more steps to measure in this method, but since measurement is done with smaller span and resolution
bandwidth for each signal, the signal-to-noise ratio is increased and more accurate measurement result will be
obtained. It will be explained below how to measure the harmonic of 1 GHz signals.
a) Set the output signal of the signal generator.
Set the frequency of the signal generator as 1GHz and power as -10dBm. Connect the output of the signal
generator to the input port of the spectrum analyzer, as shown in Fig. 4-1. Enable the ON state of the radio
frequency.