1A Teletype Test Set

This article is about the test set in general. For specific test set in the Connections Museum, see CMS:1A Teletype Test Set.

The 1A Teletype Test Set is a character generator and strobe measuring set. It is motor driven, and can generate and transmit common test characters like R and Y as well as test messages from code discs. It uses a flashing neon lamp to illuminate the outside edge of the large spinning wheel on the front. The neon lamp flashes whenever the test set receives a “marking” signal (logical 1), and off when it receives a “spacing” signal (logical 0). Users could measure the length of the flashes to calibrate signals coming from Teletypes.