Re: Class D audio amp power rating
- From: "Phil Allison" <philallison@xxxxxxxxxx>
- Date: Sat, 23 Jun 2007 13:37:52 +1000
"John Popelish"
BobG wrote:
Can you see 3% distortion on a scope?
If the 3% is caused by clipping or zero crossing distortion, almost
certainly. If it is a combination of only second and third harmonics, not
at all certain.
** With any respectable * analogue * scope - 3% waveform distortion
with a sine wave is easily visible.
If the sine shape has become asymmetrical ( ie 2nd harmonic ) - it shows up
as one maxima being larger than the other.
One can easily see slight peak amplitude compression or a slight inflexion
near the zero line that when checked on a THD meter is about 2 or 3 %.
Very small amounts of peak clipping can be seen - little as 0.5%
Forget doing this with a digital scope where all sine waves look distorted
and noisy anyhow.
........ Phil
.
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