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Testing DC Motors
1. Disconnect the motor from the line.
2. To test the brush rigging, field coils and armature, connect one meter lead to the grounded
motor housing and the other 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 (one at a time). Leave one lead
connected to the grounded motor housing while testing the motor components. This also
applies to DC Generators.
Testing Cables
1. Disconnect the cable under test from the line.
2. Disconnect the opposite end of the cable to avoid errors as a result of leakage from other
equipment.
3. Check each conductor to ground and/or lead sheath by connecting one meter lead to ground
and/or lead sheath and the other meter lead to each of the conductors in turn.
4. Check insulation resistance between conductors by connecting meter leads to conductors in
pairs. Refer to diagram. In the diagram, note that the 3-conductor cable has two wires shorted
to the ground shield. This two-wire/shield connection is then connected to one side of the
meter. The remaining conductor is connected to the other side of the meter.
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