A Function Generator Using Cold-Cathode Selector Tubes

A method of generating voltages which are arbitrary functions of time is suggested in which a chain of cold-cathode selector tubes is used as a single-pole, multi-position switch: accuracies of ±1 per cent can be achieved with relatively simple adjustment. A generator using this method is described in detail, and typical output curves are shown. The generator is extremely versatile, not only due to the range of functions which can be produced, but also due to its ability to: 1) operate over a wide range of speeds, 2) change instantaneously from one speed to another, and 3) generate two separate functions, one displaced with respect to the other by a variable, preset delay.