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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$ }( H- R. v9 i( D K/ @: S
increased until 150 % of the rated voltage, current or power is reached. The voltage or the" _8 B' r! z& [" g. N, F1 k
current shall be increased until 150 % of the rated power is reached. The test shall be
+ x8 K2 Q$ z# bcontinued until the LED module is thermally stabilised. A stable condition is reached, if the s; ~& H+ k1 s5 A3 [6 [
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in
5 {! T3 i8 e; d( G1 H5 S% kthe tc point. The LED module shall withstand the overpower condition for at least 15 min, the8 @2 J; {4 ^$ s* ]! h0 ~
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, } @2 p! i/ @/ B. S; H7 t& M, [
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power
6 |7 H* p: e" Wover this period, the module has passed the test, provided the compliance (4.1 and last2 _; s' f0 U* b" n( u/ T& c7 v
paragraph of 13.2) is fulfilled. ]1 g D. E) U+ i
After finalising the overpower mode, the module is operated under normal conditions until
/ l# P) ^9 {& u" ]; Jthermally being stable.& A; r6 U7 z3 r8 L
A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min' ` L- D5 v4 X
overpower condition has been withstood. To check whether molten material might present a: R- Y) E: c. t+ n# `' I4 y& l
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module+ q6 k8 z3 i* [2 r
shall not ignite. |
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