2014 Caterpillar SR4B, Generator Ends, Megger Test Results: Main Rotor - Positive = 3.49 megohm, Negative = 3.47 megohm @ 500V. Exciter Field - >550 megohm @ 500V. Main Stator - > 2200 megohm @ 1000V. Test Equipment - Fluke 1503 Insulation Tester Dims and weight estimated. For SCR Drill Rig Service. ,