Phil,
like you I never looked into the details of the DAC's usage nor their "error" or the respective results.
I simply use the PICSTEP firmware and it gives wonderfull results.
5 % of one quarterstep (= 0.25/step) is only 0.0125/step, this doesn't look really important for our applications.
How they do 1/16th: just to smooth the motor's movement, certainly not to perfectly increase the resolution to exactly 1/16th with 1% precision.
Must say that I didn't try 1/16 yet, the new firmware wasn't available at that time.
A stepper motor has a bigger tolerance problem per step than this.
If my memory serves me right, Mariss, Gerry and others have pointed this out several times, microstepping doesn't increase resolution.
Regards,
Luc.
. |