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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
2 {6 S+ V( f% A' T0 G5 E. wincreased until 150 % of the rated voltage, current or power is reached. The voltage or the9 o5 u/ F4 s& k8 |. D; r) E8 T7 g
current shall be increased until 150 % of the rated power is reached. The test shall be" x! @$ S9 r5 f; k
continued until the LED module is thermally stabilised. A stable condition is reached, if the2 y, M- l+ C; W* c& k7 w
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in/ D5 Q# g% j6 {0 E
the tc point. The LED module shall withstand the overpower condition for at least 15 min, the8 ]) j- h% s2 u# i% ~, t
time period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
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7 R0 Z. T6 y% E1 |If the module contains an automatic protective device or circuit which limits the power, it is
# e7 U9 i5 Y+ ^7 ^' q, Msubjected to a 15 min operation at this limit. If the device or circuit effectively limits the power; I% S S+ k3 R' o7 A
over this period, the module has passed the test, provided the compliance (4.1 and last
3 ~8 G6 X9 {+ K3 P* ?. Dparagraph of 13.2) is fulfilled.
. B9 r" X3 E+ T" I8 p9 @3 vAfter finalising the overpower mode, the module is operated under normal conditions until
0 [& Q0 ?3 i0 [7 fthermally being stable.
5 ^& U: t7 M/ A. v- x% B8 a" TA module fails safe if no fire, smoke or flammable gas is produced and if the 15 min2 Q7 {* f0 J- A. Y7 E
overpower condition has been withstood. To check whether molten material might present a
9 @% T3 R) D9 w& H, z- c1 e3 h3 Ssafety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module, o3 J4 ^& w% z9 C7 H& X+ E1 `
shall not ignite. |
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