This part of GB/T 4074 specifies the following test methods:
——Test method 5: Resistance;
——Test method 13: Breakdown voltage;
——Test method 14: Paint film continuity;
——Test method 19: Dielectric loss Factor;
——Test method 23: pinhole. For definitions, general test methods and a list of winding wire test methods, see GB/T 4074.1.