Device description: continuous time interval analyzer, event-timer, 0.9 ps single-shot timing resolution, max. measuring rate 4 Msa/S, 2 channels, min. input pulse amplitude 50 mV p-p, min. imput pulse width 1.5 ns, PCI-E interface.
Specification: http://crystel.ru/images/GuideTech_GT668SLR_Datasheet_01_01_15RS.pdf