Method and apparatus for measuring time

Details Method and apparatus for measuring time Method and apparatus for measuring time

1979-09-24

1981-12-01

Krass, Errol A.

Boots, shoes, and leggings

235 92T, 364571, G04F 706

Patent

active

043039839

ABSTRACT:
A time duration is measured precisely and with high resolution by making three time measurements as shown in FIG. 5. The time difference t.sub.A between the leading edge of a start signal and the next following leading edge of a constant frequency time base signal is measured. The number "n" of the following leading edges is then counted including the leading edge of the time base signal following a stop signal. The number n is multiplied by the period T.sub.Q of the time signal. The time difference t.sub.E between the leading edge of the stop signal and the next following leading edge of the time base signal is measured. The real time difference .DELTA.t is then calculated as follows .DELTA.t=t.sub.A +n.multidot.T.sub.Q -t.sub.E. A three part real time measurement is performed to correct the calculated result for drift and aging. Calibration measurements are made and the respective calibration factors are used in calculating the final results. The respective circuit arrangement includes a start channel, a stop channel, and the corresponding supporting circuits.

REFERENCES:
patent: 3970828 (1976-07-01), Klein
patent: 4142680 (1979-03-01), Oswald et al.
patent: 4168525 (1979-09-01), Russell
patent: 4186298 (1980-01-01), Kinbara
patent: 4192130 (1980-03-01), Takeuchi
Begley et al., "Precision Timing Systems: Part I, Standard Scales", Instruments and Control Systems-Sep. 1970, pp. 87-89.

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