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Understanding Terminology
Curtis Industries, a leading manufacturer of superior-
quality electronic and electrical components and
assemblies for more than 70 years, offers a complete
line of RFI power line filters designed to help your
equipment meet FCC and CE requirements on
conducted EMI.
Radio frequency interference (RFI) is unwanted
noise generated by a wide variety of electronic and
electrical devices. Governments of most industrial
countries, including the United States, Canada and
the European Union have enacted guidelines on
emitted RFI.
Curtis designs quality into every product and then
tests for quality by specification compliance, including
hipot, component value, grounding and leakage,
on a 100% production basis. We employ a rigorous
component qualification program with thorough incoming
and on-line inspection procedures. Our computer-
controlled 100% safety and performance testing to
demanding customer requirements is your assurance of
the highest quality RFI filters available today.
This section provides you with some basic
knowledge on terminology and technical information
helpful in solving your noise emission in power circuits.
For additional information visit our website at
www.curtisind.com.
De ? nitions
Attenuation: The decrease in intensity
or absorption of electromagnetic energy.
Expressed in dB.
Conducted Interference: Electromagnetic
signals entering a device through direct
connection.
Emissions: The level of electromagnetic
disturbances equipment causes to its
environment.
Filter: Remove electrical noise or interference
from the power line by cleaning up the sine
wave.
Immunity: The level to which equipment is
immune to electromagnetic disturbances in
its environment
Impedance: Opposition to the ? ow of
electrical current when a given voltage is
applied.
Inductor: Passive component that produces a
voltage proportional to the change in current.
Measured in Henrys.
Insertion Loss: The electromagnetic signal
loss resulting from the insertion of a ? lter in a
transmission line. Expressed in dB.
84
www.curtisind.com
Curtis Industries
A Division of Powers Holdings, Inc.
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