Turnable database with TimeLine

Well, the Timeline is a strobe; but I do not say that with disdain. It is just a fact. It is a very precise strobe with reported 0.0002% accuracy. As with any measurement device it must be used properly. The results must be interpreted properly as well. I know it is too late in some cases; but I propose that when using the timeline, 9 minutes minimum should be the measurement cycle. That is just short of 1000 rotations of the platter. If turntable speed accuracy is in the 0.003% range like Peter's SME deck, then that will show an error of 0.03 rotations. For example, 0.03 rotations is 10.8 degrees. If the laser line is projected out to a wall 18" away, then the drift after 1000 rotations will be 3.4". Measuring 3.4" vs. less than 0.5" will reduce the affect of measurement error and give more accurate speed measurement results.

From Jfrech's post about the Grand Prix Monaco:

"A highly accurate test procedure has demonstrated the speed error to be an extremely low .002%! Speed accuracy equals frequency accuracy, which means there is virtually no distortion on playback."

Is anyone else wondering what their highly accurate test procedure is?

Halcro
Agree it would be nice to have consistency in the test methods.

HF Dover
Phase lag is a result of drag, not a cause of it.

Peterayer,
I wasn't including you amongst those who have said that a very high-mass platter on a string or thread-drive turntable would be immune to stylus drag as you have admitted the fact......
Dertonearm and Dover I believe in the past (amongst many others previous to the advent of the Timeline)....have made such claims.
Yet I have shown on my video of the Raven AC-2....the comparison when the stylus is NOT in the groove and I think that that gives a further comparison to both the motor, belt/string/thread and platter abilities of a belt-drive turntable......or ANY type of turntable.
Your comments (and Syntax's) about only being concerned by the performance when the stylus is tracking the record....is misleading.
I have recordings that have extremely modulated grooves and I have records which have very benignly modulated grooves.
I can adjust the motor controller to handle one or the other.....but unless the speed is manipulated for each and every record you play.......there will inevitable be a difference in the Timeline between different recordings.
This is why seeing the Timeline 'without load' in comparison to 'under load' is valuable.

Dinster,
I have the Feikert App and the 10" Test record to go with it and have done repeated testing on both my tables using my iPad and posting the relevant print-outs.

The important thing about scientific or objective testing...is 'repeatability'.
In other words....every time you or I proceed to test exactly the same thing....we should achieve exactly the same result?

With the Feikert App.....I achieved different results every single time I repeated exactly the same tests?
In some cases...the results even showed the Raven AC-2 giving better results than the Victor TT-101? :-)
The test record itself was a major part of the problem.....
Due to the fact that it contains a modulated groove of exactly 3150Hz....it is essential that the record hole is dead-centre.
This is simply unachievable to the degree necessary to avoid variations from that constant test tone.

With the Timeline......every test result is repeatable....