Time interval meter

Details Time interval meter Time interval meter

G - Physics

04

C

328/188, 58/0.3

G04C 3/00 (2006.01) G04F 5/00 (2006.01) G04F 10/10 (2006.01)

Patent

CA 1135515

- 11 - Abstract A time interval meter for measuring extreme- ly short time intervals includes a timing circuit operable at a fast predetermined rate over the time interval between first and second events, and operable at a slow predetermined rate which is precisely scaled to the first rate over a time interval between the occurence of the second event and the upper limit of a predetermined timing window. During the slow ramp period, clock pulses are counted to provide a count which is proportional to that portion of the predeter- mined timing window occupied by the slow ramp inter- val. The fast ramp time interval may then be readily attained by subtracting the slow ramp interval from the total time of the timing window. The circuit includes a control circuit, a timing circuit including a capacitor and a pair of selectable constant current sources, and a counter.

359036

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