In this video you will learn how to properly test an armature. Their are 3 test that most be done to determine a good or bad armature.
These test are:
1) 180⁰ resistance test measures the resistance of the winding on the commutator bars at 180⁰ apart.
2) Bar to Bar resistance test measures each individual bar in a loop.
3) Bar to Ground resistance test is done to ensure that theirs no continuity from the commutator bar to the armature shaft.