|
|
加拿大标准CSA22.2 No.36关于PTC发热体测试方法如下:0 m' E( E5 ^% C: L/ W: C
Cl. 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.+ O V* I& B/ M8 @" i y% [& \1 F% D! X
+ w, ?; {) Q" u( Q% @& C$ Q$ x. D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。 |
|