IEC 60925:2001 pdf download
IEC 60925:2001 pdf download.Dc supplied electronic ballasts fortubular fluorescent lamps – Performance requirements.
3 General note on tests
Tests shall be made under the conditions specified In annex A
All ballasts specified in this standard shall comply with the requirements of IEC 60924
Conformity with IEC 61547 may be declared by the manufacturer and need not form part of third party approval to this standard.
4 Marking
Non-mandatory information which may be made available by the manufacturer:
a) Ballast lumen factor.
b) Rated output frequency (at the design voltage, with and without the lamp operating).
C) Limits of the ambient temperature range within which Ihe ballast will operate suitably al the declared rated voltage range.
5 Starting
It may be expected that ballasts complying with this standard, when associated with lamps which comply with IEC 60081. will provide satisfactory starting (not hot restarting) of the lamp with an air temperature immediately around the lamp of between 10 °C and 35 •C at the minimum of the rated voltage range; and operation between 10 °C and 50 C at other voltages within the rated voltage range.
The lamp electrical characteristics, on the lamp data sheets in IEC 60081. apply to lamps operated with a reference ballast at its rated voltage, in an ambient temperature of 25 °C.
Ballasts shall provide reliable starling of the appropriate lamps over the limits of the ambienl temperature range declared by the manufacturer,
Compliance is checked by the tests of clauses 6 and 7 unless evidence of sats factory lamp life can be given by the manufacturer.
6 Open-circuIt voltage at terminations of lamp
A ballast when operated at any voltage within its rated voltage range shall provide an open• circuit voltage at the lamp terminations such that:
a) the minimum r.m.s. voltage across the lamp is at least that shown in the third column of table 1;
b) the peak voltage across the lamp does not exceed that shown in the fourth or fifth column of table 1;
C) the minimum peak voltage from one end of the lamp to the starting aid shall be at least that shown in the sixth column of table 1.
When ballasts are designed to operate lamps In parallel circuits, the relevant requirements shall be met for each separate lamp. Independent of the number of lamps Inserted. Lamps operated with electronic ballasts complying with this standard require a starting aid as specified in IEC 60081 except in the case of lamps with a diameter of 16 mm maximum where the starting aid shall be positioned 7 mm from the lamp.
During these tests each lamp cathode shall be replaced by a resistor having the same value as the substitution resistor on the relevant lamp data sheet of IEC 60081.
NOTE Ti* maximum values in table I are higher tflan those recommended in IEC 60081 because 01 the greater voltage range ot the supply voltage. This may lead to a decreased usetul lamp lie.
7 Pre-heating conditions
7.1 Minimum voltage across lamp cathode
With a resistor of the objective value specified on the relevant lamp data sheet of IEC 60081. substituted for each lamp cathode and when operated at any voltage within the rated voltage range, the ballast shall deliver a voltage at each resistor of at least 3,05 V r.m.s. for low resistance cathode lamps and of at least 6,5 V r.m.s. for high resistance cathode lamps.
7.2 Maximum voltage across lamp cathode
a) Ballasts for lamps with low resistance cathodes
With a resistor of the obiective value specified on the relevant lamp data sheet of
IEC 60061 substituted for each lamp cathode and when operated at any voltage within
the rated voltage range, the ballast shall deliver a voltage at each resistor not exceeding
6,5 V r.m.s.
b)Ballasts for lamps with high resistance cathodes.
