EN-12
If the motor is disconnected at the motor terminals, connect one
megohmmeter lead to the grounded motor housing and the other
lead to one of the motor leads.
DC-Disconnect the motor from the line. To 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 Generators.
