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KRA-4000M
DIGITAL INSULATION TESTER
test the brush rigging, field coils and armature connect one
megohmmeter lead to the grounded motor housing and the
other lead to the brush on the commutator. If the resistance
measurement indicates a weakness, raise the brushes off
the commutator and separately test the armature, field coils
and brush rigging by connecting one megohmmeter lead to
each of them individually, leaving the other connected to the
grounded motor housing. The above also applies to DC
Gemerators.
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