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|  MIL-L-27160 (USAF)
h. the following constants shall be determined:
C1 = 1.0984 Y
R
C2 = 0.3556 Y
R
C1 and C2 are determined by solving the following equations simultaneously:
0.4476 =
RC1
Y+RC1+BC2
0.4076 =
Y
Y+RC1+BC2
4.5.5.2.1 Color correction graph. Known light sources shall be determined by taking
spectral analysis data and computing the true x and y coordinates for a NBS combination
of 2360K light source and filter which yield color coordinate limits as specified herein. A
minimum of the four corners of the specified limits plus an intermediate point on each side
of the square area encompassing the specified limits shall be used for calibration of the
photometer. Once it is determined through calibration what the photometer reads when
measuring the known sources of white light, a new polygon shall be determined by
connecting the points as read by straight lines. This shall be the new tolerance for that
photometer. Any readings falling outside these limits shall be cause for rejection of the
instrument lighting. The changing of any component in the photometer that would affect
the calibration shall necessitate recalibration. See figure 1 for an example of this
calibration procedure.
4.5.5.3 Color measurements. Color measurements shall be made as follows:
a. Apply 4.5 0.05V to the instrument under test
b. Focus the photometer visually on the numeral indicia pointer or areas to be measured.
c. Insure that while readings are being taken, the 0.015 inch diameter circle does not
move off its desired setting. record the Y (foot-lamberts), R, and B readings with the
photometer axis perpendicular to the instrument to be measured.
8
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