JA10.6 Calculations
Perform the following data manipulation and calculation tasks for each dimming level (100 percent, 20 percent and minimum dimming level claimed by the manufacturer):
Calculate percent amplitude modulation (percent flicker) of unfiltered data over the duration of the test for a given dimming level using the following equation:
| Percent Amplitude Modulation = |
(Max - Min) (Max + Min) |
x 100 |
Where:
Max is the maximum recorded light level or voltage from the test apparatus during the duration of the test for a given dimming level.
Min is the minimum recorded light level or voltage from the test apparatus during the duration of the test for a given dimming level.
Conduct a Fourier analysis to transform data for each dimming level into the frequency domain.
Filter frequency data to evaluate the data under four additional different conditions: frequencies under 40 Hz (data above 40 Hz is set to 0), and frequencies under 90 Hz, 200 Hz, 400 Hz, and 1,000 Hz.
Perform inverse Fourier transform to place data back in time domain.
Calculate percent amplitude modulation on resulting time domain data for each filtered dataset over the full sampling duration.