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DIGIstrobo for Speed and Wow and Flutter Measurement, Thoughts? Experience? Competition? Dubious W&F Method?
post Jun 7 2010, 21:21
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DIGIstrobo: Clock Your Speed. Plus Calculate Your W&F?

Hello again.

I'm gearing up for round two of USB turntable sampling. This time I'm taking on USB DJ turntables. I planning to measure turntable speed, in addition to tracking force.

After some research, the only equipment I've found that fits bill is the DIGIstrobo from an Italian company called hifi4music. Positive Feedback has a nice review.

Does anyone have experience with this type of equipment? Are there similar "digi-tachs" I should consider?

I want to measure the speed out-of-the-box, not adjust it for the proper speed. That is why I'm not looking at traditional strobe discs.

Measures Wow and Flutter?
The manufacturer claims you can measure wow and flutter with it- something I would love to provide.

Here's how it works: While you're taking the speed reading, it keeps track of the lowest and highest speed recorded. Presumably, you arrive at a percentage based on largest deviation from the average speed.

The DIGIstrobo claims to be accurate to "0.05% (or 0.1 rpm)."

Clearly, this is a crude measurement but can you really arrive at even a crude WRMS or WTD figure through this method? Or is it really a speed variance measurement? The review uses the terms interchangeably.

The last time we discussed W&F measurement, I got the impression that the WRMS figure represents a deviation from a test tone, not a direct deviation from the measured speed.

If I come up with a percentage based on the DIGIstrobo method, do I even dare call W&F?
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post Jun 7 2010, 23:40
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I don't think I'd trust that thing for wow & flutter. The review says something about a small disc and reflective tape. I don't know how any of that works, but I assume the reflective tape only gives you one measurement per revolution.

I understand that wow & flutter are a couple of basic measurements/specs for a turntable, but it's not something I ever worried about. I don't think I've ever heard flutter from a turntable, and I've only heard wow when there was something obviously wrong with a belt or drive wheel and the turntable was "dragging" (playing slow).

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