Wow and Flutter measurements like you've never seen before! Maybe...

[Balle Clorin]

@Balle Clorin What is the actual IMU chip in the Shake'n'spin? The data sheet will tell all.

The 'data' captured is most likely in the noise/error/minimum floor of the A/D converters in the IMU and all you are doing when filtering is looking for a 'trend', not an absolute indicator of true wow or flutter.

Minute turntable variations in rotational velocity are at the absolute bottom end of the most sensitive ranges of these chips- they aren't designed or capable of accuracy or repeatability in measurements- they are mass produced for phones, tablets and drones, not precision turntables.

Do not know what IMU, anyway it clearly show different and repeatable results for all the 30 turntables I have measured. I do not always trust the calculated DIN W&F though

 

[Speedskater]

In another mode, could the Go Direct Sensor be used to measure turntable isolation devices?
Maybe on a DIY shaker table (a cheap subwoofer).

 

[Balle Clorin]

You already have that. Rest your cartridge on a stationary record and do a recording ..

 

[Luca Sorrentino]

@Balle Clorin Can the shakenspin acquire an arbitrary amount of data/samplerate?
For example 5 minutes and save it in cvs in your pc?

 

[restorer-john]

I do not always trust the calculated DIN W&F though

Did you get a copy of the 6 NAB calibrated flutter files I uploaded a while back? They can be used to cross-check your app for flutter accuracy across two standards.

 

[Balle Clorin]

Skaknspin cannot interpret sound. I did post some ovelay of phone app and test record in The Fun with vinyl measurements thread., the shape was quite similar, but the inherent record WF is at the same level as a good turntable and makes comparison difficult in any case

 

[Luca Sorrentino]

In addition to my previous calculations, I've "reconstructed" speed variation and polar plots from the FFT spectrum, this permits to complete filter out the white noise of the sensor.
It's a work in progress. Two turns are represented.