How to calculate pulses per degree for an incremental encoder

March 2, 2016

When using an Incremental Encoder, you often have to know how many pulses there are per degree of rotation. This is a very straightforward math problem. Pulses per Degree = Number of encoder pulses per rotation/Number of degrees in a circle For a 5000 Line count incremental rotary encoder we...

QD145 Incremental Encoder IP-66 Sealing Option

February 24, 2016

Quantum Devices Inc. has a mounting option that allows for IP-66 sealing of the QD145 Incremental Encoder.  There are two o-rings in the clam shell design; One o-ring seals the encoder to the mounting surface (usually a motor), and the other o-ring seals the end bell housing that covers the...

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...

Cross-referencing RENCO Incremental Encoders

February 3, 2016

We have always been able to come up with a suitable replacement for Renco encoders, but our customers are making us aware that we need to point that out. For those who don’t know, Renco, after being absorbed by Heidenhain, made the decision to  eliminate much of their product line. ...

The use of potentiometers in Incremental Encoder Design

January 26, 2016

Recently I decided to catalog the competitive Incremental Encoders that have populated the shelves surrounding my desk.  In doing so, I was surprised to find that many of our competitors use potentiometers in their designs. I can understand why they need to use potentiometers.  In most designs the potentiometers are...

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” 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?...

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