Re: Tachs and encoders.

I knoe everytime this topic comes up Jon can be counted on to beat his
tach drum and tout the advantages at low speed. But it seems to me the
tach output will drop off to zero at low speed. In fact, if you turn a
motor slow enough its tach will generate no measureable voltage.

If the motor is running so slow that the time between encoder steps is
to long to adjust the servo loop then wouldnt the tach output also be
zero?

So, how does a tach help at low speed?

ron ginger