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我将有关文字复制在此：; z+ @- o) [8 q3 S9 w& M2 ?
20 Functional safety (EBLF)& D% v7 |! p& l( o. Z8 m) w
The appropriate lamp associated to the ballast shall provide the necessary light output after: S. u2 e3 |3 |+ |9 S" S
change over to the emergency mode. This is verified if the declared Emergency ballast lumen
$ I# l/ c* [+ _( b# D4 Wfactor (EBLF) is achieved during emergency operation at 25 °C.& y! B4 q) A$ |8 M+ |* v1 e7 K
Compliance is checked by the following test:* [; O; E" k* ?1 J. `
a) ballast provided with batteries:0 E. W7 g2 k# i/ Q5 v% q
The voltage supplied to the ballast by the batteries is continuously measured during* Y3 j5 ~7 z- k7 W: N6 x
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The% r: I! \2 Q" {
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after
' ~9 D' m$ w8 ?7 ^" D' rfailure of the normal supply and the end of rated duration of operation are retained for the
- x, K- _* I. c& ?5 o2 |. mEBLF measurement.
9 A# _! S) U" P1 Kb) ballast not provided with batteries and designed for d.c. central supply system:4 ^- L' @- ?5 l$ R
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
& \4 ?0 T# G. ^) H& a: Yretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
8 E6 ^! {+ n1 n8 n. brated voltage (V1) unless specifically advised of a different value by the control gear2 A5 {- \, v9 k: {9 x7 c
manufacturer.6 o0 c$ W; {$ |, S- p% L3 {
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause
( ? G: T9 x# |- ?4 r' p22.16.1- _; D' `! m1 h0 @, F$ ^9 `) D9 R
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and/ T2 K4 R% N5 U. J7 p
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,+ v% _" W# G1 S
then in steady conditions at Vmin.
! {' q% L) i; F" C& ?, j5 wThe lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall! D6 A3 H7 u0 v, @/ {, ~$ } @
be retained and shall reach at least the declared EBLF.6 ^( T" ~3 ~% D' z0 g
The value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.
) Y: J5 Q. `7 U- T! R8 I& VNOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.* |. i8 H$ E/ J, e1 d* `5 L
As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered." N& V$ S0 V: y" m' V7 P9 L9 c
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.1 S( F F/ u) U9 G+ D& X" c
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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; U( H2 Q* Y* QF译得不错。3 t- j' N M' m2 n% S) P. ~
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