On Tue, 7 Nov 2017 12:28:31 -0500 Gene Heskett <[email protected]> wrote:
> On Tuesday 07 November 2017 10:08:33 Peter C. Wallace wrote: > > > On Tue, 7 Nov 2017, Gene Heskett wrote: > > > I fail to see why a 2 or 3 percent error in duty cycle and or > > > quadrature results in so much noise. There simply is no way in hell > > > that spindle can be moving at 200 rpms on one servo-thread sample, > > > and 600 rpms on the next sample one millisecond later while its > > > filtered display on a pyvcp tach dial says 400 rpms. Mean value = (200rpms + 600rpms)/2 = 800rpms/2 = 400 rpms. 2 pulses each millisecond, add some noise and sometimes it is 1 pulse while other times 3 pulses each millisecond. Multiply by 200 => 200*(1 2 3) = (200, 400, 600). How many pulses each time value is calculated? ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
