微波炉输入功率和电流
微波炉在工作的时候电流和功率一直在下降，按照标准说的取一个代表性的时间段，计算平均值，
这个代表性的时间段怎么确定？ 根据60335-2-25，负载用1公斤水，那水烧开了不就行了？
3.1.9 Normal operation
operation of the appliance with 1000g+/-50g of potable water at an initial temperature of 20C+/-2C in a cylindrical borosilicate glass vessel having a maximum thichness of 3mm and an outside diameter of approximately 190mm. The vessel is placed on teh certre of the shelf.
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