Description: The output from incremental optical encoders and from many other types of measurement devices is known as a “quadrature” signal. A quadrature signal consists of two square waves 90° out of phase. The input channel on our encoder interface board counts the square wave transitions and determines direction by comparing whether channel A is leading channel B or vice-versa. The number of revolutions is determined by dividing the count by the number of pulses per revolution: e.g., 100 counts with a 1000 PPR (Pulses Per Revolution) encoder is equal to 36 degrees. Velocity is computed the same way by counting the number of pulses per second.
File list (Check if you may need any files):
quad.v
quadrature decoder.jpg