Analog and Hybrid Computer Programming, 2nd Edition

D An oscilloscope multiplexer

Most oscilloscopes provide at least two y-channels which allow the display of two curves at once on the screen. Although this is often sufficient for work with an analog computer, sometimes it is desirable to have not only two y-inputs but several pairs of x- and y-inputs. This allows multiple figures, each defined by a corresponding x, y signal pair, to be displayed. Since this is not possible with most standard oscilloscopes the need for an x, y oscilloscope multiplexer arises.²²⁶

Figure D.1 shows the prototype implementation of the four channel multiplexer described in the following.

The schematic is shown in figure D.2. It features four y- and four x-inputs and yields a single y- and x-output to the oscilloscope. ...