PDSH 995 Voltage across lamp during pre-heating time

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PDSH 995

Voltage across lamp during pre-heating time

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60929(ed.2) & 60929(ed.3) & 60929(ed.4) 0 {# ^4 Y& I4 C3 Q* G) Z

6 [7 i' @$ y# `4 KStandard(s):
IEC 60929 All editions
# ]! t% T: @  w5 z# \' E/ \  jSubclause(s): 7
/ K5 y7 X6 W% m* zNo. Year PDSH 0995 2010
Category: LITE Developed by: ETF5 OSM/LUM
Subject:
Voltage across lamp during pre-heating time
% v* Y% K' ?2 Y, Q  s& I; m% C( WKey words:
- Residual d.c. voltage
- Measurement
- Pre-heating time
( l5 }1 s. i8 [" ^% r! ^To be approved at the 49th CTL Plenary Meeting, in 2012
Question:
The standard requires that during the pre-heating time, the open circuit voltage across the lamp
substitution resistor, shall not exceed the maximum values specified on the lamp data sheets. On the
& h0 ^! `4 U; kballast in question we found during the pre-heating time an open circuit voltage waveform which is the
sum 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
& O$ _" m2 P: o7 T! V& ovoltage stored in a little capacitor of about 5-10 nF and has no enough energy to start or to damage the
% H8 n* c& K$ n1 O5 E# u' llamp. If we repeat the measurement with an high resistance (10 K
) between the two cathodes, we find
+ M2 V: y! `/ b& X% y% K0 a& E) Fthe indicated voltage waveform. In this condition the test is OK.
Decision:
6 E3 n, Z. c; k. N* lDo not take into consideration the residual d.c. voltage when making the measurement.


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