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我将有关文字复制在此：- K& \, k V) Z# P4 m0 T" c
20 Functional safety (EBLF)
0 S( @. k* s) ]+ ]' kThe appropriate lamp associated to the ballast shall provide the necessary light output after8 W% }4 v) {9 V' a
change over to the emergency mode. This is verified if the declared Emergency ballast lumen2 F$ p% p/ _/ o9 T8 ]$ y5 U8 I
factor (EBLF) is achieved during emergency operation at 25 °C.
) m! y2 E& o* H1 s1 W5 y% g+ tCompliance is checked by the following test:
8 c0 A3 g1 x _a) ballast provided with batteries:
0 f. K0 k1 ]. c7 o1 N9 N! vThe voltage supplied to the ballast by the batteries is continuously measured during
n3 e, T& H) P' zemergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The8 O/ \. F1 M# d1 ]* p& q' m
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after3 {0 I0 ^/ u7 ^% m0 j7 M7 p
failure of the normal supply and the end of rated duration of operation are retained for the6 g- A( [3 ~2 H
EBLF measurement.6 d: b8 S/ n ]
b) ballast not provided with batteries and designed for d.c. central supply system:
5 @9 }( _9 @; [; B4 f% m9 m0 aThe rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
2 y+ n9 z$ Y' Oretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the# S* [' D# S4 o( x% d
rated voltage (V1) unless specifically advised of a different value by the control gear+ ^- `5 O0 i8 } X& o7 u
manufacturer." P9 |$ G$ F! s, ^/ h6 q
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause2 X& B% Q' P6 e3 h" @9 H/ q) V
22.16.1
4 f( X* k% q) g* `- P: f, mMeasurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and
+ X9 g- q$ |( Q! Khaving not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,
+ t! G8 \1 J; T. v" S, Tthen in steady conditions at Vmin./ @" _# G; M5 n8 s! C) L
The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall! b: C( O( o* K# l( }) p
be retained and shall reach at least the declared EBLF.) W5 n2 R; ~" w9 j
The value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.
/ ?4 [& Z8 J5 e* j, O3 q* _: KNOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.
4 q% E6 P0 d4 t, mAs declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.* U2 {2 ?* F+ i" Y
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.- U3 h; X3 ~3 s8 W7 ^- P
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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F译得不错。
% ^5 g, g( u( r* p" Y, Z7 ?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
