Originally Posted by
JFettig
All encoders arent quadrature are they? Thats one thing I have been wondering about, I havent been able to figure that out, I was about to order some 500cpr encoders but I wasnt sure if it woudl have been 500 pulses per rev or 2000pulses per rev.
Jon
From a practical standpoint, encoders are either absolute, or quadrature. You might find a non-quadrature encode to use as a tachometer, but it probably wouldn't have that many counts.
500 CPR will "probably" have 500 lines. Each line will cause two transitions (one from light to dark and one from dark to light). There will be be two detectors, oriented 1/4 cycle apart. So, first one will see a dark to light transition, then the other will see the same transition (for motion in a constant direction). You don't get 2000 pulses per rev, but the hardware does generate 2000 transitions per rev.
Ken
Kenneth Lerman
55 Main Street
Newtown, CT 06470