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我将有关文字复制在此：: v. U0 C1 L' [1 x9 A1 a1 ]) y
20 Functional safety (EBLF)9 O/ t$ E$ M f) r8 T* W( D
The appropriate lamp associated to the ballast shall provide the necessary light output after
/ R, S4 X2 I! [1 V) r/ |! i6 ^change over to the emergency mode. This is verified if the declared Emergency ballast lumen: T$ U* l, O) h' V- F
factor (EBLF) is achieved during emergency operation at 25 °C.* B# F, P/ d% m5 d+ A
Compliance is checked by the following test:
: G+ r- A% ~+ s7 ^+ t; Ga) ballast provided with batteries:
5 R. r' e. i: X9 t1 D& VThe voltage supplied to the ballast by the batteries is continuously measured during
% {" R: K1 ]* H+ O! M$ uemergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The9 i5 q0 S9 d6 u$ y, A2 p
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after
* d/ Z- C* H4 ` Pfailure of the normal supply and the end of rated duration of operation are retained for the
/ }/ J% t0 Z+ j* Z9 [EBLF measurement.
% |' T: W* T9 `- D; l {! jb) ballast not provided with batteries and designed for d.c. central supply system:3 X& T# b0 Y$ D
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
% N: G; }5 Y2 J7 [retained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the$ s: y- t l3 i) f# W6 m
rated voltage (V1) unless specifically advised of a different value by the control gear# c& x: m6 f, B3 }
manufacturer.: b. E6 K$ R: ?
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause
+ o5 Y0 Y. A, p" i22.16.1# @' L* }, O/ Q! t2 P- Q
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and; U7 _! @; d) E% L" e
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,: k* ~! ?- @6 O" |
then in steady conditions at Vmin./ z) Y) V. P: p4 ?
The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall. G" J. ]; f8 c
be retained and shall reach at least the declared EBLF.
; G M. J( N1 Y3 _! VThe value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.
, @$ }" |0 e% G+ ^7 K; mNOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.
- Y9 ? j( I8 t1 C1 X! O N9 h% tAs declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.
6 H. `6 i, W# O; z3 OAny 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.
' W7 o" u6 y+ } V: d2 T6 \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.- F1 M2 q. A. p0 K, o
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F译得不错。! e( W2 R) ~7 f
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