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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 ?" c" a: y& X. R" w+ G. }$ jincreased until 150 % of the rated voltage, current or power is reached. The voltage or the: D# U1 K9 y* ~) {
current shall be increased until 150 % of the rated power is reached. The test shall be2 e( n3 m. V. X. w# a" Y
continued until the LED module is thermally stabilised. A stable condition is reached, if the
% N% [ k: o4 ctemperature does not change by more than 5 K in 1 h. The temperature shall be measured in
7 ~" o& s: E% m( O r# }the tc point. The LED module shall withstand the overpower condition for at least 15 min, the4 c' w7 B3 o5 \
time period of which can lie within the stabilisation period if the temperature change is ≤ 5K.( v: n8 S6 U$ {. s# f3 E/ D
0 I7 |3 J4 X3 ]1 Y# g" I* nIf the module contains an automatic protective device or circuit which limits the power, it is% L4 n3 V9 c) h
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power; u/ ? \- S4 m4 `
over this period, the module has passed the test, provided the compliance (4.1 and last7 `% w, H$ ]) o+ G+ ?
paragraph of 13.2) is fulfilled.
/ _8 [' {% E% y8 ^( s1 f# [- @After finalising the overpower mode, the module is operated under normal conditions until
: R( \2 B7 F! ~" O, G5 R. Q1 }6 [ ~thermally being stable.
! d9 P) o9 E, }, AA module fails safe if no fire, smoke or flammable gas is produced and if the 15 min% K2 T. r1 X5 y; k" m; {6 Z
overpower condition has been withstood. To check whether molten material might present a; G* j8 E- E. m0 }: k
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module3 T* g7 @. p4 @( p
shall not ignite. |
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