QD145 Incremental Encoder Shaft Tolerance

March 9, 2016

I received a phone call the other day that caught me a bit off guard. A customer was asking what tolerance they need to have on their motor shaft for it to fit with one of our incremental encoders.   I reflexively told the customer that we machine our shaft...

Quantum Devices Interface Cable for the QDH20

February 16, 2016

Quantum Devices is now offering an interface cable to our QDH20 series of Industrial Incremental Encoders. While we like to focus more on building encoders than “add on” products, we did find this to be something that made sense to offer with our QDH20 encoders. At this time the ten...

Help picking the resolution of an Incremental Encoder

February 9, 2016

I recently received an e-mail asking for some help picking the right resolution for an Optical Incremental Encoder.  I have removed the personal information and the drive/controller information, otherwise the e-mail is verbatim: Hi, I am using a  motor controller in dual loop velocity mode. What resolution incremental encoder would...

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?...

Why can’t I see my Optical Encoder Output Signals?

October 21, 2014

Why do my incremental encoder signals disappear? Today I was called to the production floor after one of the test Technicians noticed that the encoder signals disappeared from the oscilloscope when they ran the encoders “unloaded”. I asked one of the techs if the encoders being tested were of 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,...

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...

Build an Incremental Encoder Quick Tester

May 6, 2014

How to build a portable incremental encoder tester. Every once in while it’s nice to have a hand-held device that can be used to see quickly if encoder signals are present.  I designed and built a quick-tester that allows for fast interface to an encoder without having to drag out...

Using an optical encoder to measure angles

April 23, 2014

I have interfaced a 200 LC QD145 to a DL06 PLC to show how to convert from a line count to mechanical degrees. This type of conversion may be useful for any application needing to know an angular measurement. To calculate a degree measurement we divide 360 by the line...

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