The Fluke 1736 and 1738 three-phase power loggers are lightweight portable long-term online monitoring instruments designed for electrical maintenance and energy audit engineers. No external power adapter required; the unit draws power directly from the measured circuit, paired with flexible iFlex current clamps to greatly simplify on-site wiring. Intelligent wiring self-check automatically identifies connection faults and cuts human measurement errors. The instrument simultaneously logs over 500 electrical parameters including three-phase voltage, current, power, harmonics, unbalance, flicker, voltage dips/swells and outages, supporting weeks of unattended continuous recording. Equipped with Fluke Connect wireless connectivity, real-time data can be remotely viewed via mobile phones to avoid risks of working near live high-voltage panels. The bundled Energy Analyze Plus software generates professional power quality reports compliant with EN50160 and IEEE519 standards with one click. The upgraded 1738 model features exclusive power quality health summary and full disturbance waveform capture to accurately locate intermittent hidden power disturbances, widely used for energy accounting and power quality troubleshooting in factory distribution, commercial buildings, PV power stations, EV charging piles and data centers.