Re: determining stepper motor current

Hi Mariss,
If anybody else had said it could be done............!
I'll give it a try. Certainly won't hurt.
Thankyou. Another secret from the dark lab. :-))
RichD

Mariss Freimanis wrote:

>
> RichD,
>
> Actually a battery powered multimeter set to DC Amps at very low
> speeds (< 1 step per sec) or AC Amps at higher speeds (>240 full
> steps per sec) is a terrific and very accurate way to measure step
> motor phase current directly. Mind that the current will be Amps RMS
> for the AC setting.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, RichD <cmsteam@s...> wrote:
> > Alan,
> > Meter??
> > I hope you know that you can't use an ampmeter to measure motor
> current.
> > It's chopping at ~20kHz.
> > The best way is to calculate based on the sense resistor value as
> given
> > before and set the VRef pot accordingly to needs.
> > I don't understand the 1.2 vs 3.4 diff unless your ohmeter is ??? or
> > the diff is that the higher reading is across a center tapped coil.
> > RichD