What is Hysteresis and how is it used in optical encoders?

April 15, 2013

Here are a few definitions of the word “hysteresis” I found online: From Sensorland.com Hysteresis – Non-uniqueness in the relationship between two variables as a parameter increases or decreases. Also called deadband, or that portion of a system’s response where a change in input does not produce a change in...

Temperature Effects on Optical Encoders

April 8, 2013

. In Optical Encoders the item most affected by temperature is the output of the Light source. In most cases this is an LED. Below is a graph of the relative light output of the light source measured as photocell current on an optical encoder over temperature. You can see...

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

March 27, 2013

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 and only...

Bearing Encoder vs Modular Encoder – Making the right choice.

March 20, 2013

The following is a comparison of Bearing encoders vs Modular (Bearingless) encoders for use in Brush less DC Motors. Construction Bearing encoders have a shaft that is centered to the body of the encoder on a bearing system. Modular encoders have a shaft that does not use bearings so the...

Calculating Output Frequency for Rotary Encoders

March 10, 2013

Here are three handy calculations for incremental rotary encoders: Frequency  = (RPM X Line Count/60) Use this formula when line count of the encoder and RPM are known.  The answer is in Hertz (Hz) or cycles per second.  Keep in mind that many encoders and drives will have a Maximum...

Interfacing to 26C31 Line Drivers in QDI Rotary Encoders

March 2, 2013

Encoder Electrical Structure The internal electrical structure of the QDI series of encoders consists of a photo interrupted light source that is picked up by a common mode photo detector array. “Common mode” means that there are two channels that are at exact opposite states in any position.  The advantage...

Preferred Wiring Methods for Optical Encoders

February 26, 2013

Following these guidelines will reduce the possibility of noise, false counts, ground loops, and other power related problems. Keep Cable lengths as short as possible The longer the cable length the more likely it is to act as an antenna and pick up unwanted noise. Keeping the lengths short reduces...

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