When making measurements with a digital multimeter (DMM), common errors will crop up. The following discussion will help you eliminate potential measure- ment errors and achieve the greatest accuracy with aDMM. This paper covers system cabling errors and dcvoltage measurement errors. For an overview of acvoltage measurement errors, see Application Note AN 1389-3. For a discussion of resistance; dc current; ac current; and frequency and period measurement errors, see Application Note AN 1389-2. (NOTE: The Agilent 34401A, a 6-1/2-digit, high-performance DMM with both benchtop and system features, will be used as an example throughout this article).