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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
6 _9 C9 |; h& pincreased until 150 % of the rated voltage, current or power is reached. The voltage or the7 j6 N) E2 _* {6 B* b; N
current shall be increased until 150 % of the rated power is reached. The test shall be
+ b+ Q0 a- G: U) C, r$ ]0 r9 mcontinued until the LED module is thermally stabilised. A stable condition is reached, if the% f% G2 _. y* G2 p7 F' S& g
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in. N1 h* c4 j! C/ U& E0 `
the tc point. The LED module shall withstand the overpower condition for at least 15 min, the
\. [% H9 r1 R( otime period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
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1 t5 Q) H9 q+ x! c* cIf the module contains an automatic protective device or circuit which limits the power, it is- M3 r/ t, J& t) p2 C0 ~
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power
, D6 r- i! N9 g1 u/ bover this period, the module has passed the test, provided the compliance (4.1 and last; j* J( u* W z- a. C$ k% d
paragraph of 13.2) is fulfilled.* @: |" B2 c( C- q! C
After finalising the overpower mode, the module is operated under normal conditions until
$ Y/ {0 I" |' V" W/ p7 ~9 Tthermally being stable.
7 U: z& ]0 k0 k: G( x& YA module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
9 i4 h* a, }; h5 g/ k; h5 M7 qoverpower condition has been withstood. To check whether molten material might present a
% S* j) @' {3 f' `3 X" c v" dsafety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module2 _: `1 i- p# U$ ~7 F
shall not ignite. |
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