Delay

A perfect coincidence occurs when two pulses of different sources arrive at the same time. However there are several factors that might delay one pulse from the other systematically, and therefore hiding the real correlation of such sources. Delays typically arise from different lengths on electrical cables, optical fibers, or travel paths of the particles being detected. Other scenarios given by the nature of the process such as gating lasers vs the emitted fluorescence generate delays between the pulses arriving at the coincidence counter.

In these cases, a delay compensation is handful. In a Tausand Abacus, a delay can be added to any of the inputs allowing this time compensation.