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
