Why do my optical encoder signals look this way?

August 12, 2015

I received an email from a customer who was seeing “not symmetrical” data channels on some optical encoders we shipped to them Hi Jim, The data channels are not symmetrical and there appears to be something superimposed on the index. Attached are pictures. Can I return these for your evaluation?...

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,...

Quantum Devices Optical Encoder Black/White Wire

August 2, 2014

What’s with this black-white wire? Quantum devices QR145 and QR200 Optical Encoders feature an extra black & white-stripped wire that serves as an alternate grounding connection for the encoder. This wire is intended to be used in situations where the encoder flex mount is not case grounded.  The Black/white wire...

Inverted Flex Mount for QD145 Optical Encoder

July 19, 2014

O. .Another way to mount an Optical Encoder Instead of using an end bell,  a lot of our motor manufacturer customers recess the QD145 optical encoder into an extended motor housing and then seal the motor with an end plate. This has the advantage of being a lower cost item...

Understanding Incremental Encoder signals

June 29, 2014

Which incremental encoder wires should I use? Channels A & B (Incremental Channels) Use only A (or only B) for an RPM or counting applications where the rotation is either unidirectional, or where you don’t need to know direction. Use A and B together to know direction. After two low...

Gray Code for Rotary Incremental Encoders

June 17, 2014

Gray code was named for Frank Gray, a Bell labs researcher, who patented the procession in 1953,  even though a form of it was used by Emile Baudot for telegraphy as early as 1878. The most important thing to understand about Gray code is that only one bit changes from...

Interfacing a 5Volt Incremental Encoder to 12 Volts

June 4, 2014

. Interfacing to an Incremental Encoder using an optoisolator When I chose the PLC that I wanted to build incremental encoder applications around, The DL06 seemed like a perfect low cost option, but what I failed to notice was that it had a minimum 12V input requirement to turn on...

Using an Optical Encoder to show RPM on a PLC

April 27, 2014

. I have interfaced a 200 line count QD145 optical encoder to a DL06 PLC.  The PLC’s inputs are set up in high speed mode to receive the incremental quadrature pulses coming from the optical encoder. . CT174, the designated high speed up/down counter is used to interface to the...

Optical Encoder Pulse Counting with a PLC

April 19, 2014

I have interfaced a QD145 200 Line Count Optical Encoder to a DL06 PLC and set up the PLC for mode 20 ‘High speed Up/Down counter’. Here is a video of Optical Encoder Counting: Below is the ladder logic code for programming the PLC to count pulses from the QD145...

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