Job Description:

• 1) Tests armatures and field assemblies for motors to locate short, open, or grounded circuits, using electrical test apparatus that shows defects on panel meters or oscillograph patterns: Places armature in fixture equipped with brush contactors or touches test prods to commutator bars to make bar-to-bar and similar tests.

• 2) Compares meter readings with fixed calibration on meter to determine shorts, opens, and grounds.

• 3) Connects master unit, such as armature or field assembly, to terminals of winding tester.

• 4) Looks into oscilloscope to compare test pattern of each unit tested with master unit.

• 5) Turns dials to create different test situations and recognizes differences from master pattern.

• 6) Inspects unit for mechanical defects.

• 7) Scrapes chips and dirt from commutator slots, using brush and pick.

• 8) Records quantity and classification of rejects and total number tested.

• 9) May replace and revarnish string bands, reconnect leads, and resolder connections to repair armatures.