> 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.





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