The Indispensable Digital Multimeter
This tool is a must-have when it comes to electrical troubleshooting
In this article, electrician Brian Walo explains what to look for in a digital multimeter (DMM): style (some meters include a split fork, a hook, or a clamp), leads, display, the maximum number of amps the tool can read, whether the DMM has an auto-ranging or manual-ranging feature or both, category rating, durability, and accuracy. A multimeter measures three basic components of electrical energy: volts, amps, and ohms. Walo explains each of these components and provides instructions for using a DMM to measure each one. In a sidebar, he discusses the differences between analog and digital multimeters and why he prefers digital.