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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
+ X/ @$ k5 s1 ]7 N6 x' R: aincreased until 150 % of the rated voltage, current or power is reached. The voltage or the# W! D' i4 {* F f3 H" l9 K. p* Z2 |
current shall be increased until 150 % of the rated power is reached. The test shall be3 ? y' Q1 V, V, Z5 v" ]
continued until the LED module is thermally stabilised. A stable condition is reached, if the0 M5 }% b @, o
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in6 w! S* |8 c" ^& K7 }
the tc point. The LED module shall withstand the overpower condition for at least 15 min, the9 G# Y4 i+ s7 A1 L# n* ?& S
time period of which can lie within the stabilisation period if the temperature change is ≤ 5K.4 H) z" q& B5 K f
* Y, ?+ A; a3 Y2 V7 w6 @ d
If the module contains an automatic protective device or circuit which limits the power, it is
( J" ?! u7 d+ h9 G* V1 g3 wsubjected to a 15 min operation at this limit. If the device or circuit effectively limits the power
?% E+ T# L; e8 o hover this period, the module has passed the test, provided the compliance (4.1 and last+ x- p& @8 U. H: f5 r6 p
paragraph of 13.2) is fulfilled.
3 F' }7 P* d% y) w, k8 {" K$ yAfter finalising the overpower mode, the module is operated under normal conditions until2 k3 N4 f$ d# \: y
thermally being stable.5 `# w. v( ~7 U$ h( s* _0 V' I
A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
% H, U8 i" |3 Y* t9 l ioverpower condition has been withstood. To check whether molten material might present a
0 }' e8 {7 P! E" U* `safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module0 R4 Z) r& {/ x) a
shall not ignite. |
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