To analyze a circuit using Multisim, open the file as shown in picture 1. The spectrum analyzer is circled which is where the frequency spectrum of the circuit is measured and displayed. The spectrum analyzer will determine where the 7th and 9th frequency harmonics are located.
Picture 1: Multisim circuit diagram with spectrum analyzer highlighted
The following picture is taken from the spectrum analyzer display and it shows the cursor on the 7th harmonic (13 kHz).
Picture 2: Spectrum analyzer display with the cursor set on the 7th harmonic
The next picture taken of the spectrum analyzer display shows the cursor on the 9th harmonic (17 kHz).
Picture 3: Spectrum Analyzer display with the cursor set on the 9th harmonic