Extech Instruments MG500 Manuel d'utilisateur télécharger pdf (Page 11)

MG500-EU-EN v1.0 7/13

DCMotorTest

1. Disconnectthemotorfromtheline.

2. Totestthebrushrigging,fieldcoils,andarmature,connecttheREDleadtothegrounded

motorhousingandtheGREENleadtothebrushonthecommutator.

3. Iftheresistancemeasurementindicatesaweakness,raisethebrushesoffofthe

commutator

andseparatelytestthearmature,fieldcoils,andbrushriggingbyconnecting

oneleadtoeachindividually,leavingthe otherconnectedtothegroundedmotorhousing.

ThisalsoappliestoDCGenerators.



TestingSingleConductorCables

1. Completelydisconnectthecable

undertestfromitssourceand

destination.

2. Connectthetestleadstothe

cableasshownatright.



TestingMultiConductorCables

1. Completelydisconnectthecableundertestfromitssourceanddestination.

2. Refertothediagramsbelowforthreepossibletests.



Core Insulation Sheath Covering

EARTH GUARD LINE

Testing one conductor to

all of the conductors

Testing one conductor

to earth

One conductor to all

minus ground

EARTH

LINE

EARTH

GUARD

LINE

EARTH

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Extech Instruments MG500 Manuel d'utilisateur Page 11