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我将有关文字复制在此：; E) I4 a9 P% {4 {# m6 j
20 Functional safety (EBLF)
9 t7 F# V; ]8 M) [* iThe appropriate lamp associated to the ballast shall provide the necessary light output after: |3 r3 ^) N2 M! `
change over to the emergency mode. This is verified if the declared Emergency ballast lumen$ Y4 |) ] g1 E v: ^
factor (EBLF) is achieved during emergency operation at 25 °C.! @( w- L4 N( D1 i; T+ p4 l2 m
Compliance is checked by the following test:( I! z& f, d% h( L9 j8 W
a) ballast provided with batteries:4 p% t& s1 u5 d: L: |( t- A# [
The voltage supplied to the ballast by the batteries is continuously measured during+ o. q+ M$ x8 k! t
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The
/ ~$ j4 }0 i1 V3 Uvalues measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after5 a& l# m! n0 R& Y5 C2 J2 b
failure of the normal supply and the end of rated duration of operation are retained for the# T: o$ i9 v! q: U: a
EBLF measurement.
4 E, q) A3 J6 {8 Cb) ballast not provided with batteries and designed for d.c. central supply system:$ G6 w8 v9 P! o) O# |
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
' U/ [, u) G) q$ a: A' rretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
: ]4 x! |2 G$ a5 p7 j! vrated voltage (V1) unless specifically advised of a different value by the control gear
, f2 P8 _$ q3 K; _8 ]1 m! L* y; }manufacturer.+ R# `2 b1 t8 u2 d/ {; U
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause, G" [" o* v( ~
22.16.1! [ }: c0 d- Z* I/ h* h/ s( s2 w3 }
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and2 l) c: K3 c# I/ y
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,
% e" w( m0 n" f1 m5 d" tthen in steady conditions at Vmin.$ [0 i. w+ v8 [3 ?9 J, y- s
The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall
; g# k1 ]" W/ n2 q6 b4 fbe retained and shall reach at least the declared EBLF.4 ?7 i1 o0 p* {+ j4 \! l0 u( E1 i3 v: _
The value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.
0 P/ |" {" e# wNOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting./ ]. }" x& Y V0 p
As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.
$ i% U: j, \! y7 `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.4 a, H& z0 k: h5 N$ X. {+ B' D1 B8 B& s M
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., F6 ^" D' x3 H% U" ?" b! i" K+ }
+ v0 v5 i3 J2 |2 d' z: F2 p0 t! V5 L+ eF译得不错。$ V# t P2 t* s I- S4 Y' a8 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
