Re: My Computer Drifts!


jdow
 

That and typical floor sweepings for the computer's time reference can give a surprising size error. Very roughly speaking a 1ppm error is 0.1 seconds per day. A 50 ppm crystal is as bad as 4 seconds per day. So your little toy's oscillator is maybe "floor sweepings." But you can have a crystal set 50 ppm off and temperature takes it another 50 ppm, 9 seconds per day or 3 seconds per 8 hours.


{o.o}


On 20220601 09:11:49, Simon Brown wrote:
Hi,

It's AMD in a small NUC, I bet it's temperature related?

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Uwe Volk via groups.io <sdr19c@...>
Sent: 01 June 2022 15:28
To: Simon Brown <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] My Computer Drifts!
 
Hi Simon,

> I run a small ASUS NUC with an AMD 4700U inside. the time drifts by a few seconds during an 8 hour period!

Maybe the standard frequency of your main power supply is not very stable on 50 Hz. Check, if other machines have this deviation also or not.

> Shirley there's a free program on the web i can use to sync with NTP?

I can recommend NetTime, very tiny, run on all Win OS incl. Win 11:
https://www.timesynctool.com/


73, Uwe








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