Finding the Index Pulse of an Incremental Encoder

October 1, 2014

The index pulse, often also called “Z” or “Marker pulse”, of an optical incremental encoder is a once per revolution digital pulse that is used for homing or count verification of incremental signals. In the QD145 and QD200 series of encoders the index pulse fires when the mark on the...

Finding the Index on an Incremental Encoder with a DMM

August 10, 2014

Sometimes you don’t have the right tools to do the job. Lets say you needed to identify where the index pulse was firing on your incremental encoder, but you left your oscilloscope in your other jacket pocket, and now all you have on hand is a DMM. Well fear not,...

What is meant by Rotary Incremental Encoder Index Pulse “gating”?

March 27, 2013

  Index gating refers to the width of the Z (index) pulse relative to the A and B channels. With ungated devices the edges of the Z pulse have no hard relation to A & B. Gating to channel A, requires the Z pulse to be high once per revolution...

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