It looks like the image I sent got trimmed off. Did I do something wrong? Regards,
Jerry > On Dec 26, 2018, at 4:21 PM, Jerry Hancock <[email protected]> wrote: > > The other issue is application priority in windows. Here’s an example. I > have a timer running at .75 seconds in Visual Basic. To the left is normal > priority and to the right I set the application to real time priority in > device manager. > > I then calculated the time between timer interrupts. I was having a problem > reading my 3457a over GPIB using Visual basic at a consistent rate. I still > can’t figure out why every 4 or 5 reads, the time increases by about .05 > seconds. It’s not in the 3457a, could be in the Keysight VISA code. What I > need is a way to read GPIB with an STM32F7 board. > > After setting the priority to real time, the standard deviation improved by a > factor of 7. By the way, I thought it was interesting that my PC counts > ticks to .1us. > > > > Regards, > > Jerry > > >> On Dec 26, 2018, at 3:42 PM, Hal Murray <[email protected]> wrote: >> >> >> [email protected] said: >>> But most people have only one counter (one internal or external timebase >>> reference) and one clock to be measured. So the measurements are one-to-one. >>> If you have more references or more clocks, you're welcome to combine 2, or >>> 3, or as many as you want. It gets complicated but in some cases this >>> complexity is justified. >> >> Lots of people have several PCs, each with their own clock. If you have >> your >> time-nut hat on, they are crappy clocks with lots of common mode errors >> (temperature, network delays). I think the techniques should apply. >> >> >> -- >> These are my opinions. I hate spam. >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
