Zip drive cables are awesome for this type of application. They are built very well and I have not had any noise related issues with them.
On Wed, Nov 25, 2020 at 10:16 AM Mark Johnsen <m...@ijohnsen.com> wrote: > I really like the ZIP drive cable in one of the first images. That brings > back memories (pun possibly). > > I have the same BOB and Rigol, but neither are getting as much use as > yours. Mark > > On Wed, Nov 25, 2020 at 7:50 AM Sam Sokolik <samco...@gmail.com> wrote: > > > Here is an image of 100hz pwm modulated with 1hz sin wave. (sent to the > > bob and measuring the analog out. > > > > > > > http://electronicsam.com/images/greenmachine/VID_20201124_215508_exported_0_1606319177524.jpg > > > > On Wed, Nov 25, 2020 at 8:29 AM Sam Sokolik <samco...@gmail.com> wrote: > > > > > The references I found say mach outputs a 200hz signal. I had tried it > > > down to 100hz.. With computer driven pwm the resolution of the is base > > > thread frequency/pwm frequency. So - when I was playing around with a > > > charge pump at 10khz and base freq of 20khz - you get 0,50% and 100%. > > 1khz > > > gives you about 20 levels. 200hz gives you about 100 levels. > > > > > > (I have tried at least down to 100hz..) > > > > > > sam > > > > > > On Wed, Nov 25, 2020 at 3:17 AM John Dammeyer <jo...@autoartisans.com> > > > wrote: > > > > > >> > > >> > From: Sam Sokolik [mailto:samco...@gmail.com] > > >> > -it is sloooowwwww. It is most likely a simple low pass. The photo > > >> here > > >> > is of a 1khz pwm signal modulated by a 1hz (yes - hz) sin wave. > You > > >> can > > >> > already see it is phase shifting. 10hz and it is attenuated to > about > > >> 2v > > >> > p-p. > > >> > -the pwm frequency didn't really affect the linearness or > performance. > > >> > > >> Just a note on this. The user manual for this BoB shows the MACH3 > setup > > >> as 100Hz for the PWM frequency not 1kHz. If I can clear space on my > > bench > > >> tomorrow I'll feed a programmable waveform generator into it and scope > > the > > >> output. But 100Hz is pretty low for PWM 0V-10V. > > >> > > >> > > >> > > >> > > >> > > >> _______________________________________________ > > >> Emc-users mailing list > > >> Emc-users@lists.sourceforge.net > > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > >> > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
