Lightning Measurement Method
Lightning Measurement Method – A measurement method that allows for the evaluation of the luma signal gain and for making chroma/luma gain comparisons. It can also provide simple indication of inter-channel timing errors indicated by a bowing in the trace between the green-magenta transition. Tektronix developed this two-dimensional Lightning display, named because of the zigzag trace pattern it produces. This display is created by plotting luminance versus B-Y in the upper half of the display and inverted luminance versus R-Y in the lower half of the display. The bright dot in the center of the screen is the luminance blanking level. The points above and below this show the plots of the different color components based on their signal amplitude. This test requires a color bar test signal be used.
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