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我将有关文字复制在此：8 J0 ]/ Y8 F0 _4 h
20 Functional safety (EBLF)( L7 B5 k% m: C+ o
The appropriate lamp associated to the ballast shall provide the necessary light output after
, C$ W! ~. L4 X9 dchange over to the emergency mode. This is verified if the declared Emergency ballast lumen
! x1 j) _4 T' }2 v$ Wfactor (EBLF) is achieved during emergency operation at 25 °C.
, p# O& T# i) ]% n/ ICompliance is checked by the following test:
, A3 n2 o* r# @1 ]- X# f- Aa) ballast provided with batteries:
J; _9 l S. RThe voltage supplied to the ballast by the batteries is continuously measured during+ ^% Q( M) t* u1 T! y4 l2 H
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The& \5 p: t1 l$ Y/ t( |4 b# k$ e
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after) Q/ B, { ^: {+ @/ U5 A! G. [
failure of the normal supply and the end of rated duration of operation are retained for the U4 q/ [( [8 x6 K
EBLF measurement.
" z" D6 K; @0 d1 Z+ l! `b) ballast not provided with batteries and designed for d.c. central supply system: Y4 Z% V# y) V. k# \! y, O
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
* s) O- k& H& xretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the; z! x3 p$ e1 y* v. P9 }
rated voltage (V1) unless specifically advised of a different value by the control gear3 K. P- w) J! c- W$ a0 c4 ]; }
manufacturer.: |) `. J j8 x. x' _3 ~: `
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause
* R4 J; ]$ t: a% z- S9 a. q6 r22.16.1$ H8 X# V4 o- e, K5 c2 a: J9 Z
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and! B6 e. V/ n, V7 [' y
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,
X O" C! o* c, ]then in steady conditions at Vmin.
* d, R, t1 S: E7 [# R3 uThe lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall
2 o; a& n" F" x6 G+ [4 Gbe retained and shall reach at least the declared EBLF.
( d* O9 d$ Q; H wThe value measured at 5 s and V1 shall reach at least 50 % of declared EBLF." h K$ Z2 T4 [+ k; `: k
NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.7 Y/ S% T/ ], o6 H
As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.! ]+ M: b) Q+ u' \7 t" H' N
Any test circuit corresponding to that of Figure 1 can be used to make the measurement of EBLF. The luminous flux of a lamp is usually measured with an integrating photometer. For ratio measurements of luminous fluxes, a suitable illuminance meter is sufficient as there is a close relationship between luminous flux and illumination at a fixed point.. _( C L+ Z6 q$ D; i2 d6 J
NOTE Other methods may apply for determining EBLF in particular methods which record permanently the luminous flux of the lamp associated to the ballast under test.
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+ F& L' C4 ]5 I6 V( m1 K5 VF译得不错。
0 H6 B2 v: Y2 b但是否注意到红字表示的地方，是否有对应关系？前面红字及相关部分如何译好？ |
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发表于 2007-8-29 15:24
发表于 2007-8-29 16:20
