How to sort out fundamental frequencies from harmonic?

Hello,
I have a problem, because I have signals with different frequencies and with their harmonic. But I need only fundamental frequencies. I have found a device: Harmonic distorsion analizer that is theoretically able to find all the fundamental frequencies. I am using PXI 6221 but now for simulating I am using waveforms. In this waveform I have 3 music voice together, but this VI is able to found only two of them. I have an E, C, A - like an "A minor " chord.
It founds After FFT analysis all the fundamental frequency is visible on the graph but I can not measure using this VI. These frequencies are 219, 260, 328 Hz, but the first one is missing. On the indicator called Measured frequency all the fundamental and the harmonic frequency can be seen. Displaid datas depend on the number set using max num tones.
I would be really happy if anybody could help me.
Unfortunately this forum not allowes to attach wav files, but I can send it to anybody by e-mail.
Thanks you
Attachments:
topic.vi ‏46 KB

Hello Sofija and Lynn,
Many thanks for your answer. At first all I have tried to find examples but it didn't help me. I addtached that datas you were interested in.
So I tired to use the harmonic distorsion analyzer to find the fundamental frequencies.
I know that values, because that waveform was made in a church and I plaid it on the organ. So I pushed 3 different key - a c' e' voices, the instrument was tuned up appoximately 438 Hz, so the frequencies of these voices is possible to be calculated using some frequency proportions
octav = 2 : 1
quint = 3 : 2
quart = 4 : 3
big terc = 5 : 4
small terc = 6 : 5
so the a' equals 438 Hz -> the e' equals: 438*4:3=328,5 Hz -> the measured value is 328,7
c' will be: 328,7*4:5= 262,98 Hz -> the measured one is 260,9
and finally the "a" will be one octav lower than the reference 438 Hz one-> so 438:2=219 -> measured one: 219,4
So in this way I know the fundamental frequencies, and on the spectrum they are visible as well, but unfortunately this device was able to found only two of them and I don't know where I did the mistake.
Attachments:
measured.values.gif ‏315 KB
values.gif ‏262 KB
inside the VI.gif ‏163 KB

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