Abstract: A method and circuit for detecting spurious transitions ("glitches", herein) upon a digital signal utilizes a test for such a glitch condition dependent upon the digital signal level and upon the polarity of subsequent transitions within a discrete sampling period to allow for the detection of any type of glitch. A simultaneous display for the sampled digital data and for the detected glitch information further allows a convenience to an operator analyzing the data. Further, the glitch detector is used as a trigger for retrieving selected portions of the sampled digital signal.