What is meant by Rotary Incremental Encoder Index Pulse “Gating”?

May 7, 2020

An INDEX PULSE is a digital signal that is generated from an incremental encoder on an individual output channel, once per revolution. This unique pulse may be used for several purposes: In conjunction with a counter, it can be used to track the total number of shaft rotations. It may...

Very High-Resolution Application Solutions with QR12 and LP12 Sine/Cosine Incremental Encoder Output

February 14, 2020

For applications that require extremely high resolution, OEM equipment designers have historically chosen to incorporate absolute encoders into their designs. Quantum Devices’ QR12 and LP12 sine/cosine encoders are now challenging the perception that absolute encoders are the only high-resolution solution available to the industry. The benefits of QR12 or LP12...

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...

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 Count optical...

Understanding Incremental Encoder Signals

June 29, 2014

Which Encoder Wires Should I Use to Begin Understanding Incremental Encoder Signals? 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...

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 handheld 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 Show RPM on a PLC

April 27, 2014

. I have interfaced a 200 line count QR145 optical encoder to a DL06 PLC. The PLC’s inputs are set up in high speed mode to receive the incremental quadrature pulses coming from the optical encoder. . CT174, the designated high speed up/down counter is used to interface to the...

Using an Optical Encoder to Measure Angles

April 23, 2014

I have interfaced a 200 LC QR145 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 of optical encoder to measure angles. To calculate a degree measurement we divide 360 by the line...

Optical Encoder Pulse Counting with a PLC

April 19, 2014

I have interfaced a QR145 200 Line Count Optical Encoder to a DL06 PLC and set up the PLC for mode 20 ‘High speed Up/Down counter’. Here is a video of Optical Encoder Counting: Below is the ladder logic code for programming the PLC to count pulses from the QR145...

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