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Accelerometers to measure panel vibrations?
Accelerometers to measure panel vibrations?
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Old Today, 03:31 PM   #361
Remlab is online now Remlab  United States
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This is the full fr of the piezo accelerometer on the dunlavy side panel. The 60hz mains AC line interference is terrible, but as far as normal, braced cabinet resonances are concerned, totally irrelevant, and can be windowed out, so for all intents and purposes, measurements from 70 hz and up are unaffected by any noise that's left in the system, and can be counted on as reliable.
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File Type: jpg Accelerometer fr vs noise.jpg (111.7 KB, 0 views)
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Last edited by Remlab; Today at 03:33 PM.
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Old Today, 03:45 PM   #362
Pano is online now Pano  United States
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Accelerometers to measure panel vibrations?
Thanks! What are we seeing on the lower, jagged plots? Is that the same thing with different smoothing? Or harmonics? Although the noise is mostly a good way down, I wonder if those spikes at 540, 660 and 880 are contributing to your cabinet measurement? That said, the spike at 300 does not seem to be contributing.

It will be interesting to see what your shielding does. Will you have to shield both sides?
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Old Today, 03:47 PM   #363
Remlab is online now Remlab  United States
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Dunlavy panel resonance vs "acoustic null technique" panel resonance. The reason I'm spending time on this is for measurement verification. I'm pretty satisfied with the results I'm getting.
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File Type: jpg Magnified.jpg (80.4 KB, 0 views)
File Type: jpg dunlavy side panel 10cm.jpg (139.3 KB, 0 views)
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Last edited by Remlab; Today at 03:50 PM.
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