AC (alternating current)
Used to indicate that voltage or current in a circuit is alternating in polarity at some frequency, as in “230
Volts AC.”
Alarms
Audible alarms alert you of changes in operating environment and battery conditions. Most can be
suppressed or delayed to eliminate unwanted noise.
Automatic voltage regulation (AVR)
AVR automatically steps up or steps down voltage to safe output levels, allowing you to work through
brownouts without unnecessary battery drain.
AVR Boost
AVR Boost automatically corrects brownout conditions. This feature automatically steps up voltage to safe
output levels, allowing you to work through brownouts without unnecessary battery drain.
AVR Trim
AVR Trim automatically corrects over-voltage conditions. This feature automatically steps down high
voltage to safe output levels and allows you to work through over-voltages without unnecessary battery
drain.
Battery
A battery is an energy storage system that is used in a UPS. The battery used in a UPS is rechargeable.
The UPS converts the DC power from the battery to AC power for use by the load.
Battery management
A term used by many UPS manufacturers to describe a suite of functions related to charging, testing and
maximizing the life of a UPS battery. Battery management may include imminent battery failure diagnosis
and indication, scheduled battery testing, hot-swappable user-replaceable batteries, high-speed battery
charging, output regulation to reduce unnecessary battery usage and/or special battery charging
techniques.
Cell Guard
This feature provides intelligent battery management that helps extend battery life.
Distortion
When used in relation to AC power distribution, this refers to deviations between the actual AC voltage
waveform delivered to the user and the ideal sine wave of voltage.
Efficiency
A ratio of output to input power expressed in percent. UPS efficiency of less than 100% causes increased
energy use.
EMI (electro-magnetic interference)
EMI usually refers to unwanted electrical noise present on a power line.
Environmental monitoring capabilities
Delivers temperature and humidity monitoring for enhanced peace of mind.
Intelligent battery management
Intelligent battery management delivers longer battery life, faster recharge and warning of battery wear.
Joule
The Joule is a measure of the amount of energy delivered by one watt of power in one second or one
million watts of power in one microsecond. The Joule rating of a surge protection device is the amount of
energy that it can absorb before it becomes damaged.
Glossary
Additional resources
Advanced power protection solutions for high availability
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