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The Megger PA9Plus is a ruggedized, full-featured instrument measuring to worldwide power quality standards (EN50160, IEC61000-4-15, IEEE1159, IEEE519). From substations, to commercial and industrial, to residential monitoring, the PA9Plus is a versatile instrument for analyzing and solving power quantity and power quality problems. The PA9Plus trends voltage, current, imbalance, power, energy, events, flicker (PST/PLT), THD, TDD, individual harmonics, and frequency. It records power quality and power flow information simultaneously, and provides on-site, integrated analysis and data retrieval capabilities without requiring a computer or PDA. The recorded information can be viewed via the graphics display, downloaded to a computer using the serial interface, or transferred using the optional Flash Memory Module.