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我将有关文字复制在此：% ?# k* B( }! O2 E' f
20 Functional safety (EBLF)
/ F9 m* T k6 s* EThe appropriate lamp associated to the ballast shall provide the necessary light output after) X# X9 `- i. s& L, g. D
change over to the emergency mode. This is verified if the declared Emergency ballast lumen% ^) J1 \) I0 G h8 z' W. ^( {7 K$ ^
factor (EBLF) is achieved during emergency operation at 25 °C.
% k; r! o$ L: ?1 Z2 e; wCompliance is checked by the following test:
5 o& ?; x' C, D5 Y7 C1 r. d/ H0 `a) ballast provided with batteries:
7 D% x: X1 Z7 v- z- v" a7 `( DThe voltage supplied to the ballast by the batteries is continuously measured during; i9 `6 A# |! a8 @
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The
+ g3 |6 P: O' V6 Y Nvalues measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after: D- n. H( P) ~' o ]0 {5 h/ v f
failure of the normal supply and the end of rated duration of operation are retained for the% l' z u* H! E' |- k
EBLF measurement.; |! O9 _0 g0 ]6 _1 n/ Q
b) ballast not provided with batteries and designed for d.c. central supply system:
4 S( f$ l6 E w: Z# A( VThe rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
3 d& P. v6 [) f9 u7 cretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
5 e' s! ~+ A0 K5 nrated voltage (V1) unless specifically advised of a different value by the control gear# s( ?% [! L( D( V4 v5 d
manufacturer.; T. @, A2 Y3 _4 D' k
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause- `& v# x) e) H( l% D
22.16.1
# O; j: X; r% f+ N0 k" XMeasurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and
* ?# N0 R7 g; t whaving not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,; R3 ]) P0 n' V$ j. S0 m1 b
then in steady conditions at Vmin.1 Y! x& }8 Y$ S ^! q. M
The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall
! u& q, q3 Q/ ~# k" b% f% E0 Gbe retained and shall reach at least the declared EBLF.
1 C Q( r; T+ Q. O, aThe value measured at 5 s and V1 shall reach at least 50 % of declared EBLF. z* s5 A4 s. T: ?4 l& K
NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting. u) w/ Y' g i8 X
As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.
, d1 V) h2 D7 ^% \# PAny 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.
) @- [' c4 {8 _) ]* LNOTE 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.) X' I3 }' @8 E% H
# c( L: @( z3 {; f* b8 d( m4 u0 M# uF译得不错。
p( e, I$ p; y$ g: F& d4 E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
