SR235 - Analog math processor w/ 36 functions
Stanford Research Systems
The SR235 Analog Processor provides a variety of convenient signal processing functions on up to two inputs. Background subtraction, ratioing and logarithmic compression are just a few of the functions which can be implemented with the SR235. With its many output functions, high accuracy, and variable filtering and gain, the SR235 is the perfect addition for any boxcar system—especially those in which a computer is unavailable to perform signal processing.