How to test the opening & reset temperatures

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How to test the opening & reset temperatures

       Testing be done in the oven that the precision of constant temp is ±1℃. When testing, the thermocouple or thermometer should be place nearest to samples. During temperature rising ,when the temperature reaches 10℃ less than rated temperature, the temperature rising rate should be less than 0.5℃per minute and the testing current should be no more than 0.01A.