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我将有关文字复制在此：% a: |( I2 I- @- p) U; A
20 Functional safety (EBLF)
5 y5 X% T9 q5 r& ~: S2 H9 xThe appropriate lamp associated to the ballast shall provide the necessary light output after) A0 K$ _0 N* g( U, u6 P
change over to the emergency mode. This is verified if the declared Emergency ballast lumen
" z2 _/ g9 [4 V. y2 j" n) x4 Sfactor (EBLF) is achieved during emergency operation at 25 °C.
6 t! t- ], ?* x4 G9 HCompliance is checked by the following test:
% Y1 m7 }# T D( h c. J# z4 h; @% W+ La) ballast provided with batteries:# g$ C* u8 K( a1 j
The voltage supplied to the ballast by the batteries is continuously measured during
/ U" F5 t% B/ oemergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The
# L8 h$ O6 n- Y* d$ yvalues measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after
1 U% j7 X& h1 w: I( X( [8 U8 Ifailure of the normal supply and the end of rated duration of operation are retained for the
7 X; @& \+ u5 V( B( w& d7 yEBLF measurement.
+ X* v3 W! H- i( y8 @" E; bb) ballast not provided with batteries and designed for d.c. central supply system:
$ h! @# O0 W& d6 {7 A. oThe rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
$ f6 g" p# ^" |retained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the( E% D; F2 G- \8 V7 ^% S4 G
rated voltage (V1) unless specifically advised of a different value by the control gear9 C# i8 F) }5 O6 Q
manufacturer.
! |/ B" _8 F% n, iNOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause a3 Q6 f5 E5 i' f4 p. d% r- E) U
22.16.1" N4 _5 F! |$ F% \
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and
- ?$ {0 g# k4 Xhaving not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,
# O9 A' U$ x K# @' A$ {9 Lthen in steady conditions at Vmin.
. f, [9 G# o' L J% I! V* NThe lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall8 l- D: S3 x6 P$ s+ G% l
be retained and shall reach at least the declared EBLF.
! Q8 x: e9 t' u6 J5 bThe value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.9 o( {- x" w% @# J. U- X* c
NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.# \) {! T8 R+ Z: ~- O. O
As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.( d+ T: L0 N0 @7 X" u5 M
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.. w7 a' \9 {) c' M3 F
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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9 ]1 E) U# e% {- n. O) IF译得不错。
/ H7 L0 |3 G9 l3 R3 m S" Q4 Z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