The 2400-series was Tek's most advanced line of analog oscilloscopes. They were "analog" in the sense that the signal path from input to CRT was analog, but they were digitally assisted. A microprocessor generated on-screen readout and cursors, and performed auxiliary functions such as auto setup and auto measurements. The front panel was "fly by wire", in that the controls did not connect directly to the circuits they operated on. Rather, the controls were read by analog-to-digital converters and translated to the actual circuit controls by digital-to-analog converters under the supervision of the microprocessor. So a logical next step, to someone, was to replace the knobs with pushbuttons. The result was a "knobless" (or nearly so) oscilloscope. A production unit was fitted with a new front panel and modified firmware.

For each control there was an "up" and " down" section of the long buttons. These were pressure-sensitive - more pressure changed the accompanying function more rapidly. This design was not popular with potential customers. Users just like knobs. Even the latest all-digital oscilloscopes have knobs. To our knowledge, only this one prototype was produced. The design was never put into production.

The standard 2445 is shown here for comparison. The knobs below the CRT screen were left as is, probably because there was not enough room for buttons.

This is one of our most unique exhibits. Come into the Museum and try it out for yourself.