A delay distortion simulation set

The delay simulator is a test instrument which produces delay as a function of frequency in the voice frequency range: 300-3,300 cps (cycles per second). Its primary function is to simulate the delay distortion of Bell System transmission facilities, including open wire, loaded cable, and carrier systems. This is accomplished by combining four variable delay characteristics. The wide variety of delay characteristics thus obtainable may be useful for testing actual data transmission systems or any other waveforms.