The Fluke 1742, 1746 and 1748 three-phase power quality loggers (1740 Series) are rugged, portable long-term online monitoring instruments engineered for electrical engineers and power distribution maintenance technicians. Fully compliant with high-precision IEC 61000-4-30 Class A standard, they measure complete power quality metrics including three-phase voltage, current, harmonics, unbalance, flicker, voltage dips/swells and outages. The flagship 1748 model additionally captures raw disturbance waveforms to accurately locate root causes of intermittent hidden power disturbances. The unit can draw power directly from the measured circuit; paired with flexible iFlex current probes to simplify wiring, intelligent self-verification eliminates connection errors. Large internal memory supports weeks of unattended logging, WiFi wireless enables real-time on-site data viewing. The bundled software generates standardized PQ reports with one click per global & domestic standards, and software upgradeable to expand functions, ideal for power quality audit and troubleshooting in factories, commercial buildings, substations, data centers and all power distribution scenarios.