Electrical engineers need to use complex tools to get their jobs done. A logic analyzer is one such tool. Using this device, an engineer can track data from signals given off by a digital system or circuit. Data is displayed on an easy-to-read LCD screen in a number of forms. The best logic analyzers are able to interface with computers through a USB port to relay the signal data to analytical software. One commonly used logic analyzer is a digital oscilloscope. This devices allows engineers to see a graphical representation of signal voltage variations along an x/y axis.