TM 5-3610-257-14
To adjust color phototube for making color separations, place same filters as those used in making actual separations in
respective phototube along with calibration wedge. Red phototube then responds to red area of the spectrum; green to
green area, and blue to blue area. Each individual phototube then responds only to specific area of spectrum transmitted
through lens when making particular filter separation. This provides automatic monitoring and response to any change in
color of light source. Phototube "standard" adjustment (100 units at 1.00 density) may be from 5 seconds to 50 seconds.
This is the maximum range for perfect repeatability. Adjust multicolor phototube as follows:
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