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Spike: An abrupt transient which comprises part of a pulse, but exceeds its average amplitude considerably.
Surge: A large, sudden change of voltage or current, usually caused by the collapse of a magnetic field
or by a shortened or opened circuit element.
Surge Protector: A device which protects component circuitry from high alternating voltage peaks or transients.
Transient: A momentary surge on a signal or power line which may cause component breakdown and failure.
UL: A common abbreviation for Underwriters’ Laboratories, Inc., a corporation supported by some underwriters
for the purpose of establishing safety standards on types of equipment or components.
Volt (V): The unit of measurement of electromotive force. One volt is equivalent to the force required to produce
a current of one ampere through a resistance of one ohm.
Voltage: Electrical pressure–i.e., the force which causes current to flow through an electrical conductor.
Voltage Rating: The maximum voltage which an electrical device or component can sustain
without breaking down.
LIT_PRO2500_manual_G.qxd 11/10/2003 3:39 PM Page 24