Skewed Encoder Waveform

April 24, 2016

I received this e-mail from a potential customer who is trying to determine why his Encoder waveform doesn’t look right.  His name has been changed to protect his identity. Hi Jim I have just come across your Web page on RPM calculation using an optical encoder and oscilloscope. I was...

Air gap in high resolution optical encoders

April 18, 2016

As the resolution of optical encoders increases, the distance from sensor to disk decreases. In the incremental encoder industry, this distance is called the “Air gap”.  In the side view photo of an optical encoder above, the two red lines indicate the air gap between the sensor and disk  in...

Incremental Encoder Engineer interview

April 4, 2016

I was featured in an interview with EEweb. Jim Miller – Application and Design Engineer at Quantum Devices How did you get into electronics/ engineering and when did you start? I started when I was pretty young, like nine or ten, taking apart radios and using an old wood-burning tool...

Incremental Encoder Lathe Automation

March 29, 2016

I have been working on a project to automate a manual lathing operation for our incremental encoder/optical encoder line. To keep things simple, thumb switches allow the set point, along with some offsets for fine-tuning, to be entered. I am not completely finished with project, but in the video below...

Cable length considerations with Incremental Encoders

March 16, 2016

The QD145, QD200 and QR12 series of optical encoders have  28 AWG conductors in the standard flying lead cable. This gauge of cable is excellent for tight bends and fitting in applications where space is a premium.  The conductors can easily handle the 250 mA max current requirement of the...

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...

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...

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