PDSH 997 Open circuit voltage measurements
http://decisions.iecee.org/icons/ecblank.gif PDSH 997
Open circuit voltage measurements
Annex A.4 – Annex A.4.1
60929(ed.2) & 60929(ed.3) & 60929(ed.4)
Standard(s):
IEC 60929 All editions
Subclause(s):
Annex A.4 – Annex A.4.1
No. Year PDSH 0997 2010
Category: LITE Developed by: ETF5 OSM/LUM
Subject:
Open circuit voltage measurements
Key words:
- Instructions
- Lamp manufacturer
- Preheating
To be approved at the 49th CTL Plenary Meeting, in 2012
Question:
For the measurement of the open circuit voltage on a ballast with two lamps in series:
1) Is it correct to take the measurements across both lamps, not one at the time, because the
total voltage of the two lamps in series has to be measured?
2) If the answer to 1) is yes, does it make sense to take the value referred in the data sheet to
one lamp as the limit value of the open circuit voltage during preheating (measured across
two lamps)?
3) During ignition, the open circuit voltage shall be greater than the minimum voltage
specified in the lamp data sheet for two lamps in series. Is there any data sheet that specifies
the minimum voltage for two lamps in series or has the minimum value for one lamp to be
used for two lamps in series?
Decision:
1) Yes.
2) Yes, if the value is indicated in the data sheet or in the instructions of the lamp manufacturer.
Otherwise, twice the value for one lamp can be used.
3) The minimum voltage must be less than the maximum value of one lamp during preheating and at least
the value of two lamps after preheating.
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