BTW - the analog out works without the 5v plugged in. - as you can see from that picture :)
On Wed, Nov 25, 2020 at 10:20 AM Sam Sokolik <samco...@gmail.com> wrote: > 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
