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发表于 2008-4-8 10:02
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引用第27楼0321于2008-04-03 15:43发表的 :
( N4 l$ ~' H1 w[quote]引用第25楼hunhunli于2008-04-03 10:52发表的 :
1 d7 _- h# }/ `# o0 P5 v那标称为110-240V 25W的又该如何计算?还有其功率远小于25W的该如何测试?(电压加到300V了功率也还小于25W)
$ ]. x m2 x- a) n% m1 K1 M6 E电热器具功率升不到应有值11章里的1.15倍该怎么办啊[/quot
- m, W" k% b+ e0 h' D3 [; g4 f2 \你说的那种应该是带PTC发热 元件的,你看下第5.13章节,' R9 X$ e2 Z% b, h
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- Y" W, C$ z4 E- p; g比如说带PTC发热的器具,220-240V, 2400W. 在230V稳定下测量的功率小于2400W. 那么在做11.7的时候系数该用 √1.15 x 240V = 257.4V ? ) n- O. G: C0 b, e5 [
根据5.13: The test for appliances with PTC heating elements are carried out at a voltage corresponding to the specified power input. When a power input greater than the rated power input is specified, the factor for multipluing the voltage is equal to the square root of the factor for mutiplying the power input. |
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