Tus neeg siv phau ntawv

Tel: [phone] Email: [e-mail]
www.salukitec.com
57
Fig. 4-18 Input Signal under 100kHz Span
g) Set the step of the center frequency as the signal frequency of the fundamental wave.
Press [Frequency] and [Frequency Step Auto ON/OFF] and enter 1 GHz.
h) Measure the second harmonic.
Press [Maker], [Marker→], [Marker→Center] and step key [↑]. Change the center frequency of the spectrum
analyzer to second harmonic by stepping operation. Press [Peak] and [Peak Search], and read the peak power.
Press [Amplitude] and [Ref Level], and set it as the peak power. Adjust the harmonic peak to the reference level.
The second harmonic amplitude is shown in Fig. 4-19.
Fig. 4-19 Second Harmonic Amplitude
i) Calculate the harmonic distortion.
Change the distortion percentage of the second harmonic to fundamental wave as shown in Fig. 4-17. The unit can
be changed again to volt in order to read the voltage ratio of two signals.
j) Measure other harmonics.
Repeat Step (i) to (j) to other harmonics to be measured. Calculate the distortion percentage of each harmonic.