MEASURING METHOD OF FLICKER OF DISCHARGE LAMP

摘要

PURPOSE:To easily measure the degree of flicker of the light emitted from a lamp when it is lit up at 50Hz, by previously measuring the peak ratio of light outputs when the lamp is lit up at 60Hz. CONSTITUTION:A discharge lamp 6 is lit up at 60Hz to measure time-dependent fluctuations of light output emitted from the lamp within one cycle for each predetermined minute time by a photo detector 1, and the measured results are recorded in a RAM 3 of a microcomputer 2. The measured data A at the (ni) address is obtained from the RAM 3 and the data B recorded at the (ni+20) address is called up therefrom to calculate the quotient M60C of the data B divided by the data A. The relationship between the peak ratio M60 of light outputs when the lamp 6 was lit up at 60Hz and the peak ratio M50 of light outputs when it was lit up at 50Hz as well as the relationship between the peak ratio M50 of light outputs and the degree of flicker felt by men, are previously recorded in an ROM 4. The peak ratio M50 of light outputs corresponding to the above quotient M60C is called up and the degree of flicker corresponding to the M50 is also called up, thereby to indicate the same at a display 5.