PDSH 995 Voltage across lamp during pre-heating time

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PDSH 995 1 w" c# n+ j' \" {7 \

Voltage across lamp during pre-heating time 8 v" T1 D8 Z, j7 Y0 ]+ E( E

7 + M; V7 X+ x$ K8 n

60929(ed.2) & 60929(ed.3) & 60929(ed.4) 5 S, _% R# d+ Z3 z' b* f

Standard(s):
IEC 60929 All editions
1 W$ q1 v. |/ c( A3 ~2 L! L/ pSubclause(s): 7
No. Year PDSH 0995 2010
Category: LITE Developed by: ETF5 OSM/LUM
0 W1 x( {5 S( [$ T6 G: u  O* PSubject:
Voltage across lamp during pre-heating time
Key words:
- Residual d.c. voltage
- Measurement
9 I, w' I$ |3 r" \7 ?$ s6 @- Pre-heating time
6 {3 w$ _) T! @& ?, nTo be approved at the 49th CTL Plenary Meeting, in 2012
; `) s4 ]: W  [Question:
* H) H, D- P/ J  Z6 JThe standard requires that during the pre-heating time, the open circuit voltage across the lamp
7 l! P; _# ?* @( S# G; U  Zsubstitution resistor, shall not exceed the maximum values specified on the lamp data sheets. On the
" D6 f+ _# n/ Q, `6 S( t+ Oballast in question we found during the pre-heating time an open circuit voltage waveform which is the
5 ~& P7 S) @* @9 |& ~% |4 wsum of a d.c. voltage and the high frequency voltage created by the oscillating circuit. If we measure the
voltage in this condition, we find a value which is higher than the limit. The d.c. voltage is a residual
voltage stored in a little capacitor of about 5-10 nF and has no enough energy to start or to damage the
lamp. If we repeat the measurement with an high resistance (10 K
) between the two cathodes, we find
/ T' R7 H, }. z2 lthe indicated voltage waveform. In this condition the test is OK.
Decision:
8 c3 {+ a$ t6 S' YDo not take into consideration the residual d.c. voltage when making the measurement.


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