IEC 60925 pdf download

IEC 60925 pdf download DC supplied electronic ballasts for tubular fluorescent lamps – Performance requirements
This standard specifies general performance requirements for electronic ballasts for use ond.c. supplies having rated voltages not exceeding 250 V, associated with fluorescent lampscomplying with lEC 60081. It shall be read in conjunction with lEC 60924.
Performance requirements for electronic ballasts for general， public transport and aircraftlighting are specified in Sections Two,Three and Four of this standard.
NOTE1 In order to obtain satisfactory performance of fluorescent lamps with d.c. supplied electronic ballasts, it isnecessary that certain features of their designs be properly co-ordinated. lt is essential, therefore, that specifica-tions for them be written in terms of measurement made against some common base-line of reference, which mustbe reasonably permanent and reproducible.
NOTE 2 These conditions may be fulfilled by reference ballasts. Moreover, the testing of ballasts for fluorescentlamps will, in general, be made with reference lamps and, in particular， by comparing results obtained on suchlamps with ballasts to be tested and with a reference ballast as specified in lEc 60921.
2Definitions
2.1
starting aid
either a conductive strip affixed to the outer surface of a lamp, or a conductive plate which isspaced an appropriate distance from a lamp.A starting aid can only be effective when it hasan adequate potential difference from one end of the lamp
2.2
ballast lumen factor
the ratio of the light output of the lamp when the ballast under test is operated at its designvoltage，compared with the light output of the same lamp operated with the appropriatereference ballast supplied at its rated voltage and frequency
2.3
reference ballast
a special inductive-type ballast designed for the purpose of providing comparison standardsfor use in testing ballasts, and for the selection of reference lamps. lt is essentiallycharacterized by a stable voltage-to-current ratio，which is relatively uninfluenced byvariations in current, temperature and the magnetic surroundings (see annex B)
2.4
symmetrical inverter
a definition is under consideration
2.5
asymmetrical inverter
a definition is under consideration
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 61 547 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 the ballast will operate suitably at the declared rated voltage range.