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 and a Brush Motor? Well, the brushes of course. Yeah, but what does that mean? The principle behind the internal working of both a brushless DC motor and a brushed DC motor are essentially the same.  When the motor windings become energized, a...

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...

Optical Encoder Waveform Triggering

July 28, 2014

. Seeing Encoder Quadrature with a two-channel scope . I received an e-mail from a customer concerned about the  “out of control” optical encoder signals he was seeing on his Oscilloscope. The photo below shows the type of signal he was seeing: The encoder in question was a 10,000 Line...

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...

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