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Glossary

Attenuation

The decrease in amplitude of electricity (voltage, current, or power) in the stop-band of a filter, referenced to the amplitude without the filter. It is generally measured at a standrad 50 Ω impedance and expressed in decibels (dB).

Conducted Interference

Undesirable electrical energy emitted by a device. The interference appears on power, signal, or control leads of the device and disrupts or degrades its performance or that of another device. Limits of conducted interference levels are generally defined by law or regulation.

Conducted Susceptibility

A measure of the interference signal level ( voltage or current) on power, signal or control leads required to cause an undesirable response or to degrade performance of a device

Decade

A frequency ratio of 10 to 1

EMI

Electromagnetic interference or unwanted electrical energy in any form

Filter

To restrict or control electrical energy at a frequency of over a frequency range, or device for doing so

Frequency Subsdivisions

VLF ( Very Low ) ... 3 kHz to 30 kHz
LF ( Low ) ... 30 kHz to 300 kHz
MF ( Medium ) ... 300 kHz to 3 MHz
HF ( High ) ... 3 MHz to 30 MHz
VHF ( Very High ) ... 30 MHz to 300 MHz
UHF (Ultra High ) ... 300 MHz to 3 GHz
SHF ( Super High ) ... 3 GHz to 30 GHZ
EHF ( Extremely High ) ... 30 GHZ to 300 GHz

Insertion Loss

The decrease in amplitude of electricity ( voltage, current, or power ) in the pass-band of a filter, referenced to the amplitude without the filter. It is generally measured at a standard 50Ω impedance and expressed decibels (dB)

Insulation Resistance

Or IR, usually the value of the dc resistance from a conducting element to the case of a filter, extrapolated from measurement of dc current flow driven by a pure and precise dc voltage applied between the filter's terminals and its case

Leakage Current

Or leakage, usually the algebraic sum of reactive currents flowing through the filter's capacitors to ground

MIL-B-5087

U.S. Government document that specifies bonding, electrical and lighting protection for aerospace systems

MIL-E-6051

U.S. Government document that specifies electromagnetic compatibility requirements for systems

MIL-F-15733

U.S. Government document for general specification of filters and capacitors for control of radio-frequency interference

MIL-F-28861

U.S. Government document for general specification of filter and capacitors for suppression of radio-frequency and electromagnetic interference

MIL-HDBK-235 (NAVY)

U.S. Government document that specifies electromagnetic ( radiated ) enviroment considerations for design and procurement of electrical and electronic equipment

MIL-HDBK-237

U.S. Government document that specifies electromagnetic compatibility program requirements

MIL-STD-202

U.S. Government document that specifies test methods for electronic and electrical components

MIL-STD-220

U.S. Government document that specifies methods of insertion loss measurement for radio-frequency filters

MIL-STD-461

U.S. Government document that specifies electromagnetic interference requirements for equipment

MIL-STD-462

U.S. Government document that specifies measurement of electromagnetic interference characteristics

MIL-STD-469

U.S. Government document that specifies radar engineering design requirements for electromagnetic compatibility

Noise

Generic term for undesirable electrical energy

Octave

A frequency ratio of 2 to 1

Radhaz

Hazard presented by electromagnetic radiation to fuels, electronic hardware, ordnance, or personnel

Radiated Interference

Undesirable electrical energy that radiates from a device or its leads, coupled for measurement purposes to a standard test antenna and receiver. Limits of radiated interference levels are generally defined by law or regulation

Radiation

The emission of energy in the form of electromagnetic waves

RFI

Radio-frequency interference, an older, somewhat restrictive term generally used interchangeably with "EMI"

RI

Radio interference, an even older and more restrictive term for "EMI"