"ARMATURE TESTER I"
Job Description and Jobs
- 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.
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Job Number: 9129