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c) The luminaire shall be tested in the enclosure for a total duration of 168 h consisting of$ P! t. T, o r; h! U# |
seven successive cycles of 24 h. Supply voltage as specified in item d) below shall be8 m/ I: k; p3 ]) g
applied to the luminaire for the first 21 h and disconnected for the remaining 3 h of each' t+ v0 t# W m& \; S2 r/ v
cycle. The initial heating period of the luminaire is part of the first test cycle.+ D* E5 C. ~3 S4 A% _. T. w
The circuit condition shall be as in normal operation for the first six cycles, and as in# f1 p" }! ^) O% }
abnormal operation (see Annex C) for the seventh cycle. For luminaires containing an
6 a2 r* F, g) W0 Q8 y; s% Melectrical motor (e.g. a fan) the abnormal condition which most adversely affects the result; A- y4 r! c! Q) U( d9 y9 Y. W; N
of the test shall be selected.
& Y% z# A) w! H" w/ ~ O4 IFor luminaires for which there is no abnormal condition test according to 12.5.1, the total& Q. G; C' y, D
test duration shall be 240 h (i.e. 10 x 24 cycles at normal operation). For filament- W# c$ A# F+ S. l
luminaires, the total test duration of 240 h shall apply in all cases.
7 x. W1 ?& r) ?* H( }标准的语句我拷下来了。最后一段的意思实在是没法理解,特别是最后一句,用灯丝灯泡的灯具要怎么做耐久?还请高手解惑。谢谢! |
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