This part of JB/T 4279 specifies the verification content of the enameled wire solvent resistance tester, including verification items, technical requirements, verification appliances, methods of verification and result processing. Among them, it specifies that the temperature requirement of the solvent is 60 ° C +/- 3 ° C, the angle between the sample and the pencil is 60 ° +/- 5 °, the force applied in the pencil direction is 5N, and the allowable error is ± 5%. Verification appliances include second-class standard mercury-filledthermometer, stopwatch or fixed clock, protractor and Q-1 enameled wire test instrument detector. The method of verification includes placing a second-class standard mercury- filledthermometer in a solvent, adjusting the temperature of the device to 60 ° C, and checking the difference between the actual temperature and the standard temperature, and measuring the angle between the pencil and the plane where the sample is placed with a protractor.