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我将有关文字复制在此：8 J* q- c, V* Q4 P7 a5 K+ l- e
20 Functional safety (EBLF)2 i7 m2 Z( u# H2 v) Y
The appropriate lamp associated to the ballast shall provide the necessary light output after2 E3 `6 r/ f$ {. P2 k
change over to the emergency mode. This is verified if the declared Emergency ballast lumen
# w7 p3 v& Y0 J3 _& W* Ffactor (EBLF) is achieved during emergency operation at 25 °C.1 i* y+ |3 ~8 W; }7 @
Compliance is checked by the following test:4 N7 c2 `1 A* O
a) ballast provided with batteries:1 W: B0 K( I( |% _4 g- N; G( Q
The voltage supplied to the ballast by the batteries is continuously measured during; P5 [5 E' W. R% Z$ T7 K
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The) x) H" F. \" H3 F! u: X
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after5 r6 y. S5 V% ~. v/ ]$ b
failure of the normal supply and the end of rated duration of operation are retained for the
' [/ k" \5 ^4 H' @: cEBLF measurement.: r* X2 b' |5 }3 X
b) ballast not provided with batteries and designed for d.c. central supply system:/ |4 G _& d/ u
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
, f! T4 w1 x! {- o9 s, S. Uretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
$ I9 l" ~$ ~4 qrated voltage (V1) unless specifically advised of a different value by the control gear
+ X8 m7 T, K& H( Omanufacturer.
( A' y; J2 U; n3 y( w2 }' E$ bNOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause
5 N" K5 P3 c* q( B22.16.1
( }+ L" C P9 m- R3 B5 iMeasurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and' Y0 a3 X T1 _
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,
1 R2 t/ V) W6 W- \: p [then in steady conditions at Vmin.
* k# w# o4 R% z9 aThe lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall
7 g4 {( w' ^1 J2 Rbe retained and shall reach at least the declared EBLF.
% c# z n w* ?& M* SThe value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.( {3 K9 h+ ]) Y+ z
NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.) q+ e3 R2 {1 ^, e' W
As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.
' O; b% G/ Q t9 P6 dAny 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.
1 D; {# x9 a+ y Z5 |# PNOTE 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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1 ?% c) ?/ F5 N/ @; w, S5 ]F译得不错。+ g0 U$ P( V" ?
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
