| special ballast designed for the purpose of providing comparison standards for use in testing ballasts, for the selection of reference lamps and for testing electric lamps from regular production under standardized conditions Note 1 to entry: A reference ballast is typically inductive for electric lamps operating on AC mains frequencies or resistive for electric lamps operating on high-frequency or low-frequency square waves. Note 2 to entry: A reference ballast operated at its rated frequency has a stable voltage/current ratio that is relatively uninfluenced by variations in current, temperature and magnetic surroundings. Note 3 to entry: This entry was numbered 845-08-36 in IEC 60050-845:1987.
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