So at 50ppm it's about 0.005% for a crystal, and .5% for a resonator.The real question though - does this manifest as jitter, or just a constant variation from the spec?
Quote from: db2db on Feb 21, 2013, 08:14 amSo at 50ppm it's about 0.005% for a crystal, and .5% for a resonator.The real question though - does this manifest as jitter, or just a constant variation from the spec? I don't think you'll see much (if any) jitter with a ceramic resonator, but you will probably see a greater variation of frequency with temperature than with a crystal. The datasheets should tell you.
To summarize, the resonator on my Uno is well within xtal specs as far as room temp accuracy. How can a device speced for 5000ppm accuracy be achieving 50ppm accuracy?
I bought my Uno for $15 at microcenter, it's made in Italy.
I bought it a microcenter, they have a slew of them in stock in houston. They are on sale for 14.99, check it out. They are R3 and work just like they are supposed to. I really doubt that a fake would perform better than the real thing.http://www.microcenter.com/product/392614/Arduino_Uno_Rev_3
I really doubt that a fake would perform better than the real thing.
It's obviously a loss leader.
If it's fake, then it's the best one ever
EDIT: Microcenter is a huge outfit that has been in the computer parts retail business for over twenty years. They now sell tons of maker, parallax and arduino doo-dads. I doubt they would throw it all away to sell some fake Unos. I invite anyone to actually prove that these are fakes instead of just making comments. Show me one thing that is wrong with them.
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