A logic analyzer (occasionally called a logical analyzer) is a laboratory test instrument designed to display and evaluate digital signals. The device works in a manner similar to the way that an oscilloscope displays and facilitates the analysis of analog signals.
In its most basic form, a logic analyzer captures and displays a sequence of digital events. Once the data are captured, they can be rendered as graphical images, state listings, or decoded traffic. Some analyzers can compare each captured data set to a previously recorded data set, and let the operator know whether or not the two data sets are identical.
The functions of a digital storage oscilloscope with a logic analyzer are combined in a lab instrument known as a mixed-signal oscilloscope. This instrument can display multiple analog and digital signals one above the other, along a common horizontal time axis.