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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:
4 _/ Y# {# y! \6 h' H! v* fCl. 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.
( M, |1 P# }* W, s5 t+ W" g( P6 m' F1 R9 F& q% j) [8 e' Z8 K A
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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