"Unruh" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED]
> I suspect that the only clock they use is the computer clock. Ie, they do > not have any special onboard hardware clock. No no, I'm using a National Insturments boards which has an internal counter. For my experiment 1 second is 1 second counted by the NI card. Actually my problem is to extimate how much good is the second counted by my card. > On Linux > date +"%s.%N" > will give the seconds and nanosecods since Jan1 1970. (well not really > since leap seconds are ignored) > But for your purposes unless you run the experiment across a leap second, > that does not matter. sorry for my english but ... what is a leap second ? If you mean that my measurement interval is less than 1 second, yes, it could be (but the NI card will measure that time). I must know how much good is the "second" measured by my NI card because after 10^5, or 10^6 measurements I must know how much time was spent, and I should know the time spent with a precision possibly less that the duration of each mesurement (1 s, or 0.1 s, or 0.01 s ... depending on how much I will be able to increase the performing of my set up) Thank you. -- Bruno Cocciaro --- Li portammo sull'orlo del baratro e ordinammo loro di volare. --- Resistevano. Volate, dicemmo. Continuavano a opporre resistenza. --- Li spingemmo oltre il bordo. E volarono. (G. Apollinaire) _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
