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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
* U9 B; V2 v2 W9 M' C) R+ tincreased until 150 % of the rated voltage, current or power is reached. The voltage or the K4 ?3 f! x6 R- i9 H% x, i
current shall be increased until 150 % of the rated power is reached. The test shall be
- b$ g p& E3 ^0 q; G! U+ ccontinued until the LED module is thermally stabilised. A stable condition is reached, if the( L7 w1 z* v( B1 E! _# T: w
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in
2 e9 ^6 p7 ?8 p1 @( Q3 i1 fthe tc point. The LED module shall withstand the overpower condition for at least 15 min, the+ \+ X/ n9 F' j% V
time period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
+ A- Z3 n" k2 _! q# g: r6 U1 z0 y0 [- Y5 a0 x3 o
If the module contains an automatic protective device or circuit which limits the power, it is
! h. q% ^( U7 usubjected to a 15 min operation at this limit. If the device or circuit effectively limits the power( z) b; E( T: b5 U- Z! q3 r$ E
over this period, the module has passed the test, provided the compliance (4.1 and last
' B) z5 s$ Z1 m& Z! V8 Pparagraph of 13.2) is fulfilled." {( q9 D4 B% }& M$ W6 {
After finalising the overpower mode, the module is operated under normal conditions until
$ `5 r: R( G3 `( }7 Sthermally being stable.& r2 u/ f: g k p. T) ~
A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
! S+ Z" ]( }" o: z, doverpower condition has been withstood. To check whether molten material might present a
+ F, a9 O* }- _! ?safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module3 Y# x% f6 l! O% @
shall not ignite. |
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