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|  PDSH 997: e2 _* s7 R+ f# } _6 u
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| Open circuit voltage measurements
; G3 m) t L: w$ A ^2 S7 Z | Annex A.4 – Annex A.4.11 V+ K, g6 r/ o3 P: S" j
| 60929(ed.2) & 60929(ed.3) & 60929(ed.4), }$ S4 N: ]0 P/ t+ d
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! ~' L2 o( @7 O8 x9 }' Q! a' F, ~Standard(s):; W2 S$ H/ I9 }6 k) j
IEC 60929 All editions
2 @/ P4 v4 x: x. ?- a) NSubclause(s):
) L0 M! L5 D% D9 rAnnex A.4 – Annex A.4.16 x7 [! e2 A$ X( {* a. c# \2 v! }
No. Year PDSH 0997 2010
* `& R' m9 j* R9 L1 D7 KCategory: LITE Developed by: ETF5 OSM/LUM
' ^2 |5 a s a6 q0 a- SSubject:
8 \( v3 z$ z: I3 t* y/ HOpen circuit voltage measurements. g- ]/ c2 B2 t/ z A& t2 |
Key words:8 M6 v9 J! U, b, s% u4 F& }
- Instructions+ K5 r( e: ^+ S! z4 j
- Lamp manufacturer
- V H+ A1 Y0 Z" K9 n( k- Preheating
& E+ s( M2 U" g8 D; rTo be approved at the 49th CTL Plenary Meeting, in 2012' g2 t1 q* i6 G n9 u( e
Question:4 @( x# k( w" k- g, T$ m' U
For the measurement of the open circuit voltage on a ballast with two lamps in series:: c5 A8 m- U* G3 r* H1 w
1) Is it correct to take the measurements across both lamps, not one at the time, because the
5 A0 Z: m y( c2 m! O& o+ Btotal voltage of the two lamps in series has to be measured?' X9 r$ ]: r1 V* t8 O
2) If the answer to 1) is yes, does it make sense to take the value referred in the data sheet to% ] B7 i0 n7 K$ O
one lamp as the limit value of the open circuit voltage during preheating (measured across
5 i/ R2 t7 \9 J Gtwo lamps)?' t$ D% A# i- d* t4 ~% k
3) During ignition, the open circuit voltage shall be greater than the minimum voltage
( t1 L( g- m; o# M* {specified in the lamp data sheet for two lamps in series. Is there any data sheet that specifies
, a% p: |7 N3 o `( r4 G+ [7 w' Q* Lthe minimum voltage for two lamps in series or has the minimum value for one lamp to be
, z1 \2 z6 b4 Hused for two lamps in series?4 ]! Z& o! c6 C6 Q/ ]2 R$ o
Decision:
; [, [/ r }! T4 Q& L1) Yes.
9 x+ M2 L# k0 @3 B: g2) Yes, if the value is indicated in the data sheet or in the instructions of the lamp manufacturer.
9 ^; i% i! {+ N) z8 |4 W8 Q8 O2 xOtherwise, twice the value for one lamp can be used.% ^# V# I% o0 }1 n2 o# j
3) The minimum voltage must be less than the maximum value of one lamp during preheating and at least
: `% k& u0 E( \. L( j# f( Ethe value of two lamps after preheating.
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