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楼主 |
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% {, a) j# L5 C/ _# e4 Y6 H
increased until 150 % of the rated voltage, current or power is reached. The voltage or the ?8 c9 t o1 V2 S" C! F# S
current shall be increased until 150 % of the rated power is reached. The test shall be* B+ S: ^9 U! p* K R
continued until the LED module is thermally stabilised. A stable condition is reached, if the) V4 |7 F/ | B
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in$ O& n' M/ i& F1 Q( r i) c% u! x
the tc point. The LED module shall withstand the overpower condition for at least 15 min, the
; P' G% E: e, R" h! Htime period of which can lie within the stabilisation period if the temperature change is ≤ 5K./ u6 X2 c( e4 b$ ^9 E9 C+ d
& c+ Q7 q5 C* v+ m9 `
If the module contains an automatic protective device or circuit which limits the power, it is/ ]; ?6 j* ~4 e: l! c
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power. H6 r/ ?4 M1 P4 R4 [3 |; Y8 K' k; r
over this period, the module has passed the test, provided the compliance (4.1 and last9 X* H" Q6 }* d$ V+ D) v
paragraph of 13.2) is fulfilled.
& X M4 Y. Q5 A( I: e- ?3 f; N+ cAfter finalising the overpower mode, the module is operated under normal conditions until
& f; n' R( k! o. J" z; V6 Kthermally being stable.8 [* u7 B, }) }4 Y. h
A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min7 M, I) k" Z- ?& d9 Z. [
overpower condition has been withstood. To check whether molten material might present a
1 n) L5 s0 K! f/ K/ o; \' K1 fsafety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module" N; E, r. f. _$ u" W! k$ Z
shall not ignite. |
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