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加拿大标准CSA22.2 No.36关于PTC发热体测试方法如下:
K! n7 G! w$ q6 v$ n7 J. X: DCl. 6.2.6 Equipment having PTC heater elements shall be tested for steady-state wattage, as demonstrated by the sample exhibiting the highest current out of a total of three samples, all of which shall exhibit approximately similar results. The steady-state rating is the wattage at thermal equilibrium or after 1 h, whichever is reached first, with the ambient air free form draughts at 25±1℃ and 48-52% relative humidity.
, \$ h1 |9 Y- u8 U' h! a) p2 I/ ^! S& w2 c! P5 s
这个标准就要求在稳定状态下测试额定功率,但是像周期性动作的PTC是根本不会有稳定后的功率,所以就采用(瓦/时)累计的方法算平均值。 |
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