Abstract: An incremental time delay generator may be disposed on a small substrate and may be used in conjunction with a time domain reflectometer. The incremental time delay generator produces an output signal at a variable time delay in response to a trigger signal and it may include a first superconducting device for generating a first pulse signal in response to the trigger signal, a transmission line configuration or a multiple inductive tap device for converting the pulse signal into a step signal wherein a time interval T is defined as the time between successive steps of the step signal; and a second superconducting device that is responsive to the step signal and produces a second pulse signal when the step signal exceeds a predetermined threshold. The time delay generated by the generator is equal to nT when the step signal exceeds the predetermined threshold in the (n+1)th step of the step signal.