A Probability Density Analyzer

An inexpensive probability analyzer is designed for the measurement of the probability density function and distribution functions of random signals. The operation principle of the system is explained through detailed discussion of each active stage. It utilizes Schmitt triggers with low hysteresis to provide good accuracy. The output of the analyzer is measured by using a counter. Experimental probability density and distribution functions are obtained for a sinusoidal input, and the measured results are in good agreement with the theoretical functions.