At 3/6/2006 09:38 AM, you wrote:
>Ok, I wasn't thinking in this direction before, but I do have an audio
>band spectrum analyzer handy.
>
>Question is, how can I translate this to a Sinad measurement?
I've been trying to figure this out too, as I've been working on an audio
spectrum analyzer program & wanted to throw in a SINAD meter.
Subsequent post from Bob M.:
>With that audio spectrum analyzer, adjust it for full
>scale on the fundamental, and look at the noise and
>any harmonics. Increase the RF signal level until this
>drops to 25% (1/4) of the level of the 1kHz tone. This
>will be the 12dB SINAD point, assuming that the
>wideband noise etc doesn't add up to more than the
>-12dB signal amplitude. Once you calibrate your
>equipment with a real SINAD setup, you should be able
>to continue using the audio SA.
So I guess I could remove the 1 kHz data from the FFT'd spectrum, do an
inverse FFT & ratio that result with the original 1 kHz signal to get
SINAD. Or maybe just add the values of all the remaining frequency bins,
but somehow I think that may not yield the same result.
?
Bob NO6B
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