DVM as PQ Troubleshooting Tool

摘要

THERE HAVE BEEN A MILLION OR MORE power quality instruments sold by dozens of manufacturers since they were introduced in the 1970s. However, a typical instrument that can measure and capture the array of PQ phenomena defined in standards such as IEEE 1159 remain priced as a capital equipment purchase for most users. Larger electrical contracting companies may have several units available for use, but a one-person company is unlikely to be able to afford the cost of an instrument. However, nearly every electrician today has a digital volt meter (DVM) with them on every job. Since a DVM measures voltage, it can be useful for certain troubleshooting applications, though without substantial memory, it doesn't have much use in benchmark or audit surveys.