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Turntable speed stabilty
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Old Yesterday, 06:41 PM   #911
Pano is offline Pano  United States
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Turntable speed stabilty
Nice graphics. At first I was confused looking at them on my phone, but then I saw the X axis. Well damped!
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Old Yesterday, 08:52 PM   #912
gpapag is offline gpapag  Greece
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Turntable speed stabilty
Quote:
Originally Posted by Hans Polak View Post

Very informative to see the noise spectrum around Fres coming down some 5 to 10 dB with brush applied.
I made a small table for easy comparison, see attachment1.
Upper table is based on 65536 points FFT
Lower table is based on 4194304 points FFT
We have to remember that low resolution FFT level skirt incorporates the peaks due to record eccentricity, while with higher resolution FFT we are able to estimate the base frequency level, separating it from the 0.55Hz effect.


Quote:
Originally Posted by Pano View Post
Nice graphics
I didnít want to scare you much.
Increasing the FFT samples, the ugly eccentricity peak consequences show up, see attached screenshots.

George
Attached Images
File Type: png LF noise analysis.PNG (28.7 KB, 12 views)
File Type: png stock brush up 0.5 to 200Hz.png (54.0 KB, 12 views)
File Type: png stock brush down 0.5 to 200Hz.png (53.1 KB, 12 views)
File Type: png cd trimmed-5dB 0.5 to 200Hz.PNG (47.2 KB, 12 views)
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