A series of free, downloadable articles from ZTEC Instruments cover the fundamentals of making oscilloscope measurements. The three-part article series covers, respectively, vertical-axis measurements, horizontal-axis measurements, and frequency-domain measurements with an oscilloscope. The articles are based on digital-storage oscilloscopes (DSOs) rather than their older, analog counterparts, and can be applied to both modular, PC-based scopes as well as stand-alone instruments. For more information, or a copy of the articles, visit the ZTEC Instruments web site at http://www.ztecinstruments.com/