1. The center frequency should be changed as the frequency value at the first
harmonic wave.
2. Change the span as 50 MHz, and display the signal in the center of screen again.
3. Set the attenuation as 0 dB
4. To recognize whether the harmonic distortion component is produced by
spectrum analyzer, firstly display the input signal in trace 2
5. Place a Delta mark in the harmonic distortion component of trace 2: