The invention concerns a device for measuring the time delay between a first periodic pulse signal (2) and a second periodic pulse signal (5) having the same frequency as the first pulse signal (2). In order to determine the time delay between the two periodic pulse signals (2, 5) in as accurate a fashion as possible, the invention proposes a device which is characterized by means for producing a periodic diagnostic signal (18), having half the frequency of the first pulse signal (2), whose sampling ratio is a measure for the time delay between the first pulse signal (2) and the second pulse signal (5) as well as means for determining the sampling ratio of the diagnostic signal (18) and means for determining the time delay between the first pulse signal (2) and the second pulse signal (5) from the sample ratio of the diagnostic signal (18).