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The article is devoted to the problem of improving the DC motor winding armature insulation technical condition diagnosing quality with regard to its frequency properties by forming the equivalent circuit of the electric motor rolling stock armature winding, which allows to determine the frequency numerical values of the parameters,the results of experimental studies of the armature winding oscillatory characteristics as a single-terminal pair are given; and the dependences of the impedance, reactance and active impedance are established. The dependences between equivalent circuits elements numerical values and turn-to-turn location for further formation diagnostic model based on the results.