Power Quality Analyzers measure efficiency in buildings and systems (as well as energy audits) by using power factoring to find potential savings, verify reliability of electrical machinery, and track sub-billing occupants for energy costs.

Power Quality determines how well a system supports reliable operation of its loads. A power disturbance or event can involve voltage, current or frequency. 

Power disturbances can originate in consumer power systems, consumer loads, or in the utility sector. Power disturbances are measured with a power analyzer and defined in terms of magnitude and duration. 

Disturbances range from transients that last for microseconds to outages that continue for hours. When a power disturbance falls outside operating limits, equipment may be disrupted or damaged. This illustrates how important a reliable power analyzer is.