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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:
" ^& _: q/ f, Q7 SCl. 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.7 V; r. z3 c }. Z5 A: r$ i
2 g: j# Z; X' {0 Z( C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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