Measuring turntable speed

I've been using the same one big greg mentioned. (Also paid full price for it :-)). Run the table with VPI's ADS. I check speed a couple times a year. It doesn't change.

Optimize, I know of no turntable were you can adjust wow and flutter. I know a bunch were you can adjust the speed. Thus a device measuring 3150 times a second is no more useful in adjusting speed than one measuring every revolution. It is revolutions per minute after all.

Is your graph more accurate than a wow and flutter meter??? Been playing with a test record and wow and flutter app lately.

Thanks
Tom

Do you mean a meter like this?
https://youtu.be/0G2kU1e9Cpo

I think that we may not need more accuracy or what to do with more accuracy than that.
That is not the game. You need enough accuracy  and resolution to be able to make different decisions lit the examples above.

When you have enough accuracy and resolution to measure the fluctuation constantly the same between measurements. By using the same method and equipment.

In the app that I used, it is written:
"You can now calculate wow of your turntable in accordance to DIN IEC 386 (formerly DIN 45507) using the recorded chart data! Expensive special equipment was needed before to do so!"

That tells me that the app developer thinks that he has and use the same method and resolution to calculate the results. As complies with the mentioned DIN standardisation.

I believe this is "good enough". With the saved graphs and with the calculations as seen in the lower left corner IS better than only a analogue meter showing only a temporary value/level and not the other mentioned calculations.
Best regards.

Optimize thanks for the information.  I have a Phoenix roadrunner for the speed which goes out to 33.333.  I have been interested, in the different turntables I have been building, to see if you can see the difference between a 35 lb platter vs 55 pounder.  Also different bearings I have been playing with.  

The roadrunner take one trigger per revolution then does the math.  But like you say what goes on for the 2 seconds.  

It would be nice to know how the software or machine samples the revolution and how accurate it really is.

I need to experiment more to see what make changes in the readings.  
 
Thanks again
Tom

Optimize, I know of no turntable were you can adjust wow and flutter. I know a bunch were you can adjust the speed. Thus a device measuring 3150 times a second is no more useful in adjusting speed than one measuring every revolution. It is revolutions per minute after all.

• As I said previously. If you add more mass with a ring clamp or other types. You will add more rotating mass and inheritance. That is indirectly a example to adjust the wow and flutter. (There is a reason why everyone is talking about "the nice and heavy platter" when looking at TT reviews. And look at high end shows. Those platters weight several kg. So they get greater inheritance and lower speed fluctuation. As simple as that.)
• Yes speed is one thing and fluctuation is something else as you say. I just wanted to point out what and how the industry standard are. We do not bring a knife to a gun fight (just wanted to say that there is a right tool for the job). :)
• Yes that is right: "It is revolutions per minute after all" (I do not know what you are trying to say with this.. RPM is just a speed expression. We could have chosen other units cm/s or like in tape speed that uses inches per second "ips") let us think what that means.. It means that during a whole minute the record has spun 33⅓ revolutions. BUT what happens if the platter has done 33½ instead? It only means that the record has turned an excess of ~20cm.. So in a whole minute the extra speed that the platter has it has resulted in a extra ~20cm.. rather unimportant if the TT rotates in 33.3 or 33.5 during that minute in my opinion. But you miss a thing of greater importance that is that our ears is much more sensitive to fluctuation (of the sound) than speed. So we are maybe obsessing about wrong things here. :)

Best regards.