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Integrating Light Meter for Fading Tests

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Abstract

The instrument is designed to use only commercially available components and is rugged and dependable. The dc measuring circuit is linked mechanically to the ac integrating circuit by means of a self-balancing potentiometer servo system. The time intergral of the intensity is accumulated on a commercial kilowatt-hour meter. Linearity and accuracy are better than one percent of the full registration rate.

© 1952 Optical Society of America

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