Accuracy of Stopwatch

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Re: Accuracy of Stopwatch

Unread postby KSoko » Wed May 19, 2010 8:36 am

hi there
nice soft, but unfortunately not stable and accurate enough to use it in open events.

Our experience with use on a MTB-DH event -> running Xnote on 2 notebooks (start/final) ->
drift over 9sec. for 2 hours (between the notebooks)
one "jump" from 15sek. just that on the second notebook
occasionally crashes if there is a parallel running macro in excel
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Re: Accuracy of Stopwatch

Unread postby Stopwatch » Thu May 20, 2010 1:07 pm

KSoko wrote:drift over 9sec. for 2 hours (between the notebooks)
one "jump" from 15sek.

What hardware and OS? Did you tried this build viewtopic.php?f=3&t=932#p1181

KSoko wrote:just that on the second notebook
occasionally crashes if there is a parallel running macro in excel

Are you using Excel integration?
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Re: Accuracy of Stopwatch

Unread postby KSoko » Fri May 21, 2010 8:03 am

Stopwatch wrote:
KSoko wrote:drift over 9sec. for 2 hours (between the notebooks)
one "jump" from 15sek.

What hardware and OS? Did you tried this build viewtopic.php?f=3&t=932#p1181

We tested few laptops (hp, toshiba, dell), mostly with XP and VISTA.
We didn't know nothing about HPET at this time, so we used the regular version of the software. I'm not sure if the notebooks are equipped with HPET-chips.

Stopwatch wrote:
KSoko wrote:just that on the second notebook
occasionally crashes if there is a parallel running macro in excel

Are you using Excel integration?

Jep, but that with the 15sek. jump was without running macros.
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Re: Accuracy of Stopwatch

Unread postby Stopwatch » Sat May 22, 2010 10:38 am

KSoko wrote:
Stopwatch wrote:What hardware and OS? Did you tried this build viewtopic.php?f=3&t=932#p1181

We tested few laptops (hp, toshiba, dell), mostly with XP and VISTA.
We didn't know nothing about HPET at this time, so we used the regular version of the software. I'm not sure if the notebooks are equipped with HPET-chips.

HPET is available over 5 years but only Vista and later takes advantage of it. Could you retest the build above on the same notebooks?

KSoko wrote:
Stopwatch wrote:
KSoko wrote:just that on the second notebook
occasionally crashes if there is a parallel running macro in excel

Are you using Excel integration?

Jep, but that with the 15sek. jump was without running macros.

Is there regularity of these crashes?
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Re: Accuracy of Stopwatch

Unread postby JanHgm » Fri May 20, 2011 12:50 pm

Last week I visited the Dutch National Measurement Institute of Time. These guys produce the NTP for the Nordic region.
My camera equipment was measured in their lab. My software required certification and now I can prove that I achieved a nearly e-8 correctness over 24 hour with camera/pc timing.

What I learned at the lab was that regular stopwatches are all inaccurate. Same for most Windows clocks but also that different Windows clocks on one system all produced different results.

Conclusion, timing is complicated business

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Re: Accuracy of Stopwatch

Unread postby Stopwatch » Sat May 21, 2011 9:58 am

JanHgm wrote:Same for most Windows clocks but also that different Windows clocks on one system all produced different results.

There are a few PC's clock hardware. Do they distinguish them or just test "a software as is"?
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