Harmonic distortion
- Thread starter ronybhai
- Start date
If you want to simply estimate the harmonic distortion,you could compare the waveshape to an ideal sinewave,but there are a number of ways in which you can test for it:
(1) Examine the signal with a Spectrum Analyser,or perhaps the FFT function of a DSO.
(2) Use a Band Stop (notch) filter centred on the fundamental frequency.
Everything at the output will be either distortion or noise,so you will read Distortion +Noise--if the noise is very low level it may be neglected.(this is the classic method used in the Noise & Distortion test set).
(3) Use a Selective Millivoltmeter.
First,tune to the fundamental,then to each harmonic in turn.
True,but if he doesn't know anything,my answers won't make any sense to him!
And he may not care if all he wants is the answers to copy onto his homework and turn in.
I don't think that is the case with this OP, if I'm recalling from prior experience. But who knows?
Actually -- with this OP that may well be all he cares about. I just went and looked at a couple of prior threads of his, such as this one:
http://forum.allaboutcircuits.com/showthread.php?t=78015
and getting him to do anything other than want the answer spoon fed to him was like pulling teeth.
bountyhunter
- Joined Sep 7, 2009
- 2,512
There are waveform analyzers that are designed to specifically read THD. They are the easiest to use.
Presumably that reasoning would apply to anyone who posts in the homework forum. They don't know so they ask for help.
I was kind of thinkig about the 1st answer you gave. Thanks
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