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我将有关文字复制在此：
- E$ Y( p0 q/ g0 f* Z9 k) z20 Functional safety (EBLF)
) m$ S5 k5 _) b1 N& ZThe appropriate lamp associated to the ballast shall provide the necessary light output after
3 z& }6 W+ \' C* M( ~change over to the emergency mode. This is verified if the declared Emergency ballast lumen
W' G2 q: d& h" R3 wfactor (EBLF) is achieved during emergency operation at 25 °C.: M U! n6 ~# Y9 L
Compliance is checked by the following test:
* Z# N8 B6 ?3 s5 I) ~9 Ka) ballast provided with batteries:3 L% ~, U6 x$ I7 v
The voltage supplied to the ballast by the batteries is continuously measured during
% B& e$ Y2 a' xemergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The
6 v) c* a7 h# s& p( h1 {- l" }values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after
# Q( T( ~" ^6 f+ N9 gfailure of the normal supply and the end of rated duration of operation are retained for the9 J+ R: ?: l/ f% y! R
EBLF measurement.* X; m+ P/ I, [- @) u# @
b) ballast not provided with batteries and designed for d.c. central supply system:7 H6 ]9 W! @6 r, C) [
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
+ g% e9 b) \1 yretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
$ [2 r2 G" c" P- z3 Irated voltage (V1) unless specifically advised of a different value by the control gear: O& L( ^1 N. X" I7 p
manufacturer.
$ l2 N' G, O, _0 {$ Q% W# yNOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause
" b- O8 R' F4 M, k/ M w, n, h22.16.1; s7 @: P8 T, S) ?
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and
; h, }, }# i4 \8 F* g+ Ihaving not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,3 a4 Y ~/ D$ c% w' X1 L
then in steady conditions at Vmin.
* e$ _" Z3 a2 h, w5 c$ |The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall! r) q; x8 J. D- P: q6 A
be retained and shall reach at least the declared EBLF.
% f8 J9 I' V0 Q7 d6 qThe value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.
t$ D: ~& H0 o: e/ x6 s% C1 B* |: dNOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.
; R2 c0 I% J* f9 GAs declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.
V: V5 Z5 a1 M% {4 QAny 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.
' w+ }+ ^7 v# x2 r( L8 A: ANOTE 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.1 X* [% ]# E' V* h3 `3 p. ?6 b2 V1 Q0 M, D
% V3 O# D, G# `( I) a
F译得不错。
$ v9 y# A) _/ S3 B2 ~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
