You have measured both of the series and shunt field windings and found that each has over 10 mega ohm to ground. Your ohm meter, however indicates a resistance of 1.5 ohms across terminals S1 and S2. The ohmmeter indicates a resistance of 225 ohms between terminal F1 and F2. Are these readings normal for this type of machine, or is there likely a problem

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DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.