Abstract
A new concept in the design of a function generator of two independent variables is presented. This design is of the photoformer variety and utilizes pulse techniques to obtain the advantages of accuracy and semiautomatic calibration and self-correction. With this particular design, many of the objections of other types of photoformers, which have been used to generate functions of single independent variables, have been eliminated, and yet this design maintains the desirable aspects of the photoformer.

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