hello

im using multisim to do fourier analysis I have this circuit and results

I put this into excel

I got a square wave from adding the odd harmonics and the fundamental

I have to find the thd

I used the square root of added harmonics (which are squared) over total voltage.

the problem,

I have a 10v square wave and im getting 6.36 for the fundamental. I don't know why, is this because the rest of the odd magnitudes add up. because when I did that I got more than 10 volts.

I got an answer of 54.45%

I used the values 2.12255, 1.27404, 0.910576 and 0.708795 all individually squared. under a square root which is over total voltage. which is the harmonic values added.

is this correct because the thd shown in excel and multisim is 42% though I thought this would be because of the even harmonics as well.

I also have this question,

any help would be great

thanks

simon

im using multisim to do fourier analysis I have this circuit and results

I put this into excel

I got a square wave from adding the odd harmonics and the fundamental

I have to find the thd

I used the square root of added harmonics (which are squared) over total voltage.

the problem,

I have a 10v square wave and im getting 6.36 for the fundamental. I don't know why, is this because the rest of the odd magnitudes add up. because when I did that I got more than 10 volts.

I got an answer of 54.45%

I used the values 2.12255, 1.27404, 0.910576 and 0.708795 all individually squared. under a square root which is over total voltage. which is the harmonic values added.

is this correct because the thd shown in excel and multisim is 42% though I thought this would be because of the even harmonics as well.

I also have this question,

- Research and determine the Fourier series formula used to construct a square wave

any help would be great

thanks

simon

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