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Ground loop (electricity)

In an electrical system, a ground loop or earth loop occurs when two points of a circuit are intended to have the same ground reference potential but instead have a different potential between them. This is typically caused when enough current is flowing in the connection between the two ground points to produce a voltage drop and cause the two points to…

Art & Measurement

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Common ground loops

Recording studioLine driverDifferential amplifierCommon-mode noiseElectrical wiring
24 related topics

In digital and RF systems

RS-232RS-485USBFireWireDVI
15 related topics

In low frequency audio and instrumentation systems

HiFiMoving coilSound reinforcement systemsPublic address systemsMusic instrument amplifiers
14 related topics

Description

Mains powerSafetyShieldMagnetic fieldsUtility lines
13 related topics

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Overview

Description

Representative circuit

Common ground loops

In low frequency audio and instrumentation systems

In analog video systems

In digital and RF systems

Internal ground loops in equipment

In circuit design

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Ground loop (electricity)

Nodes104
Edges103
Triples23
Avg. degree1.98
Density0.019231
Components1

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Important terminology

ground signal current loop cable circuit voltage equipment differential power currents loops conductor system two may noise hum shield connected

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
recording studiosinstance ofin some large professional installations0.80text
it is sometimes the practice to provide two completely separate ground connections to equipment baysinstance ofin some large professional installations0.80text
an electric motor A flowing through the building's ground system G to the neutral wire at the utility ground bonding point at the service panelinstance ofThe diagram shows leakage current from an appliance0.80text
audioinstance ofIn analog applications0.80text
the physical limitations of the transformers cause some signal degradationinstance ofIn analog applications0.80text
by limiting bandwidthinstance ofIn analog applications0.80text
adding some distortion.Balanced interconnectionBalanced connections see the spurious noise due to ground loop current as common-mode interference while the signal is differentialinstance ofIn analog applications0.80text
enabling them to be separated at the destination by circuits having a high common-mode rejection ratioinstance ofIn analog applications0.80text
S/PDIFinstance ofStandard protocols0.80text
AES3 or TOSLINK are available in relatively inexpensive equipmentinstance ofStandard protocols0.80text
allow full isolationinstance ofStandard protocols0.80text
so ground loops need not ariseinstance ofStandard protocols0.80text

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