The lost Optical Encoder Demo Box

January 20, 2016

We recently teamed up with one of our distributors to create a Demo box that showcased our QD145 optical encoder with a Delta Tau PLC and touchscreen panel.  It was sent off to a trade show where potential customers would get to spin the encoder and watch on the screen...

Finding the RPM of an Optical Encoder using an Oscilloscope

January 9, 2016

  We only need to measure one of the incremental channels in order to calculate the RPM of an optical encoder.  Using an oscilloscope to measure the period of one incremental channel A cycle. We will need to find the frequency of the incremental signal. Keep in mind that converting...

Why Do my Optical Encoder Signals Look this Way?

August 12, 2015

I received an email from a customer who was seeing “not symmetrical” optical encoder signals/data channels on 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...

Optical Encoder Calculator

March 18, 2015

Quantum Devices optical encoder Resolution/RPM/Frequency Calculator. We just added a new page to the main Quantum Devices Inc. web site that provides a way to calculate RPM, Frequency, or line count (optical encoder resolution) by entering in the other two variables. When would you want to use such a tool? ...

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 Pulse of an Incremental Encoder

October 1, 2014

The index pulse, often also called “Z” or “Marker pulse”, of an optical incremental encoder is a once per revolution digital pulse that is used for homing or count verification of incremental signals. In the QD145 and QD200 series of encoders the index pulse fires when the mark on the...

Brushless Motors vs Brush Motors, What’s the Difference?

August 27, 2014

What’s the Difference Between a Brushless Motor with a Commutating Encoder and a Brush Motor? Well, the brushes of course. And, without brushes – the need for a commutating encoder for current carrying. Yeah, but what does that mean? The principle behind the internal working of both a brushless DC...

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...

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