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 FP100 transient digital photometer with 16 bit high speed (1MSPS) high precision AD can achieve maximum 10 KHz sampling frequency, the shortest test interval of 100 us, maximum sampling points to 10000 points. It can be equipped with a variety of high-speed optical photodetector. High precision and fast detect the parameters of the illuminance, luminance, luminous flux, luminous intensity, radiation degrees. Through software analysis, the intensity, frequency, scintillation index, scintillation percentage and other parameters are obtained.