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发表于 2013-6-26 13:43
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The LED module shall be switched on and the power monitored (at the input side) and/ ]& Q7 z2 Q/ u8 K! x
increased until 150 % of the rated voltage, current or power is reached. The voltage or the: o5 S1 q7 k$ D" p8 S& s+ Y% B
current shall be increased until 150 % of the rated power is reached. The test shall be2 l4 E( r. A( m( c3 b, y8 }6 |
continued until the LED module is thermally stabilised. A stable condition is reached, if the2 u2 W, T! @9 m3 }" J
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in! e1 D7 n* z* N+ U3 }
the tc point. The LED module shall withstand the overpower condition for at least 15 min, the+ G; p- @+ M6 I; u& T# n$ n/ Q$ M
time period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
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If the module contains an automatic protective device or circuit which limits the power, it is/ U. F' g) y& L; h+ M
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power
: `2 W" p& Z) l, w# z& Hover this period, the module has passed the test, provided the compliance (4.1 and last4 p- I( d$ L1 _+ A d, F8 |
paragraph of 13.2) is fulfilled.
) d4 S, @" W" @; PAfter finalising the overpower mode, the module is operated under normal conditions until
5 `/ h' k: I% Hthermally being stable.' L5 O+ p% B/ `0 r/ d0 h
A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min/ G" s. q# G& B
overpower condition has been withstood. To check whether molten material might present a* M1 b# l- l0 Y
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module
- Y4 H: q! O7 ^shall not ignite. |
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