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...

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 Brushless 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 shaft/disk...

Calculating Output Frequency for Rotary Encoders

March 10, 2013

How to calculate Line count, Frequency, or RPM for a rotary encoder when the other two variables are known.

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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