The method comprises providing a time-to-digital converter with a measurement period (3) for registration of events (1), and selecting time intervals of independent durations (4), each of the durations being independent of the registration of events. At each registration of an event, the time-to-digital converter is blocked from further registration for one of the time intervals of independent duration. Thus the recorded lengths of the time intervals (11, 13, 14, 16) corresponding to the occurrence of the events within each measurement period are uniformly distributed and a time-domain bias is avoided. The time-to-digital converter circuit includes a controlled gate for blocking the time-to-digital converter.