LabWindows/CVI

[_trent_]

Hi,

I am trying to generate a sum of sines with Sinewave function and compute its fft to see if i can get back the magnitude of each harmonic. This is aiming at, later, getting a real signal and computing its fft. But for the moment I'm testing the code on virtual signals (square, triangle etc).

However, I fail at plotting the sum of 3 sines. I don"t understand how i can generate a first sine (fundamental) and then sines with a frequency multiple of the fundamental. (f, 3f and 5f). 

I tryed this :

Sinewave(512,5,1/512,&ph1,sine1);

PlotWaveform(...,...,sine1,512,...,1.0,0.0,0.0,1,...,...,...,1,...);

But nothing appears except a constant line.

To sum it up : I think I have understood nothing at all about how the function sinewave works, espacially about the frequency I have to pass.

Many thanks if you can help me

Regards,

_trent_

[D_Biel · Accepted solution]

Ah. This was one of those simple mistakes that takes forever to find. For the Frequency parameter you have specified "1/512", but since that is integer division, it evaluates to 0. Instead do "1.0/512".

[_trent_]

Thank you so much