Rotor Field Winding Test
- To check for grounds, attach ohmmeter leads to shaft and slip ring (each ring in turn). If reading is not infinity, replace rotor.
- To test for open field, attach ohmmeter leads to each slip ring. Resistance should measure about 2.4-2.8 ohms on 12SI series, or 1.7-2.1 ohms on 17SI series. If not, replace rotor.