On Sun, 20 Feb 2011 20:07:32 +0200, Graeme Geldenhuys <[email protected]> wrote:
>On Sun, 2011-02-20 at 12:42 +0100, Bo Berglund wrote: > >> In fact I am interested mainly in the time *difference* between >> successive measured data points. > >You can try EpicTimer too. It's only a single unit, easy to use, >supports multiple timers, stopwatch and various display modes. It's not >very portable [read not fully implemented] for exotic platforms, but >works perfectly for my needs under Linux and Windows. > > Now I have tested both the GetTickCount and Now() methods. I have synched my tests against a GPS receiver to get an accurate reference. Turns out that GetTickCount has a sawtooth-like overlaid timing noise signal which is about 15 ms. But using Now() I don't see this. In both cases I could detect a 12 ppm drift in the clock of mt PC. -- Bo Berglund Developer in Sweden -- _______________________________________________ Lazarus mailing list [email protected] http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
