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|  PDSH 997
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; D# V, m3 z) O+ U- o r | Open circuit voltage measurements
% p' q& p" ~: V+ b4 r | Annex A.4 – Annex A.4.1
$ [6 _6 d' `) `* X1 N | 60929(ed.2) & 60929(ed.3) & 60929(ed.4); I& b4 [ K0 j$ b) h, I% G! P
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Standard(s):& n& Z: d% N$ [/ C: m
IEC 60929 All editions# F& Y. u1 h. W% y! F4 L4 }
Subclause(s):( q, K m, `3 _ v) |
Annex A.4 – Annex A.4.1
, s2 w% t" g, Q, I3 `4 qNo. Year PDSH 0997 2010
+ ~8 s5 O; k1 Z" Z& e9 L! OCategory: LITE Developed by: ETF5 OSM/LUM
4 L0 k* `6 S8 A" PSubject:
5 W/ a, o# \: l6 K+ W3 f3 nOpen circuit voltage measurements5 T" O9 I7 o3 I" u1 y
Key words:
) o3 {7 @, p1 a; w- Instructions' R& ~+ x- z0 T' a& G
- Lamp manufacturer5 u8 `% ^3 o3 M ^
- Preheating G2 t: J2 n( J* o6 M+ m2 i, W6 W
To be approved at the 49th CTL Plenary Meeting, in 2012
" c: }9 P- a- NQuestion:- i; f2 L1 H* V7 g" Z
For the measurement of the open circuit voltage on a ballast with two lamps in series:
( l. R8 ~9 Z4 T3 i! ?1) Is it correct to take the measurements across both lamps, not one at the time, because the
+ _2 Z2 d& _3 V; R7 ~+ S3 J/ ^total voltage of the two lamps in series has to be measured?. |( e H8 r; o
2) If the answer to 1) is yes, does it make sense to take the value referred in the data sheet to
( u' ^ D$ c! j" L9 ]one lamp as the limit value of the open circuit voltage during preheating (measured across, R9 N: O P4 L) ?% v" V
two lamps)?6 h3 W Z& I. W# `$ h
3) During ignition, the open circuit voltage shall be greater than the minimum voltage3 R7 x1 ~ D3 H7 _
specified in the lamp data sheet for two lamps in series. Is there any data sheet that specifies
- ^( O0 W! D) T. Dthe minimum voltage for two lamps in series or has the minimum value for one lamp to be( {5 U. M5 k& G( K* ~, Z& m
used for two lamps in series?
2 R \' `5 K+ L$ `6 ?' U$ Q* KDecision:5 u. H5 L' N4 O. i8 T
1) Yes./ L5 F9 ]9 ~7 `4 A. v
2) Yes, if the value is indicated in the data sheet or in the instructions of the lamp manufacturer.
2 y, A% I: i- @: v3 t% S- r* B; o" U, XOtherwise, twice the value for one lamp can be used.
" `4 Q! a5 T! p$ K+ `# Z3) The minimum voltage must be less than the maximum value of one lamp during preheating and at least2 `( J7 M- N9 J
the value of two lamps after preheating.
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