Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Harmonics

Status
Not open for further replies.

D.M.

New Member
If i have a signal at 1 Hz, and on the oscilloscope I displayed the FFT (fourier tranform) what does each RED line mean? I understand the fundamental freqency so there is a harmonic at each multiple, but what do the magnitudes represent?

**broken link removed**
 

mbarazeen

Member
you have a non sinusoidal continuous wave input thus what you get in your spectrum is not only harmonics, its other frequency components found in the signal and with its megnitude on y axis.
fourier transform represents a continuos wave form as an addition of many sine waves with different megnitudes. you will get frequency on x axis and megnitude / power on y axis depends on the setting.
 

mneary

New Member
As long as a plot for FFT is calculated with fewer than an infinite number of perfect samples, it will contain artifacts from the process.

Your oscilloscope has offered some hints. "Low signal amplitude" means that the instrument is not receiving enough signal to even make the best of its meager accuracy. "Unstable histogram" is the scope telling you that it doesn't believe its own calculations.
 
Status
Not open for further replies.

Latest threads

Top