Choosing the Resolution of a Rotary Incremental Encoder

May 1, 2013

“What resolution of rotary encoder do I need?” is a question designers often ask themselves. A common mistake is that a higher resolution is always better. This may or may not be the case.  Ultimately it is the nature of the application that decides. Here are some things to take...

The HR12 HEDS Replacement Optical Encoder

April 27, 2013

HEDS style encoders have long been a popular choice for an enclosed low line count positional feedback device. The packaging allows for added enclosure protection in a lighter duty encoder. This type of product is often seen in applications such as vending machines, printers, plotters, positioning tables, etc.

What is Hysteresis Noise Filtering and How is it Used in Optical Encoders?

April 15, 2013

Here are a few definitions of the word “hysteresis” I found online: From 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...

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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