When you make measurements with a digital multimeter (DMM), common errors will crop up. Thefollowing discussion will help you eliminate potential measurement errors and achieve the greatest accuracy with a DMM. This paper covers acvoltage measurement errors. For an overview of system cabling errors and dc voltage measurement errors, seeApplication Note 1389-1. For a discussion of resistance; dc current; ac current; and frequency and period measurement errors, see Application Note1389-2. (NOTE: The Agilent 34401A, a 6-1/2- digit, high-performance DMM with both benchtop andsystem features, will be used as an example throughout this article).