When all the following requirements are met, it is evaluated as qualified: <br>1. Each time under the action of AC current, when the temperature of the reference wire reaches 100 ℃ ~ 105 ℃ and is stable, the sample temperature is not higher than the temperature of the reference wire; <br>2. Each cooling fitting to room temperature as long as the reference resistance of less than 1.5 times the conductor resistance; <br>3, the resistance change of the specimen is not greater than 0.15 M; <br>4, the resistance change rate and the dispersion in the sample S M is not greater than 0.15; <br>5, total cycle The number N=500.
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