Time interval meter

Details Time interval meter Time interval meter

1979-10-25

1981-11-17

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92NT, 368121, G07C 102

Patent

active

043013600

ABSTRACT:
A time interval meter for measuring extremely 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 occurrence 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 predetermined timing window occupied by the slow ramp interval. 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.

REFERENCES:
patent: 3790890 (1974-02-01), Doittau et al.
patent: 3970828 (1976-07-01), Klein

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