Time-of-day clock having a temperature compensated low power fre

Details Time-of-day clock having a temperature compensated low power fre Time-of-day clock having a temperature compensated low power fre

1983-01-17

1984-05-15

Roskoski, Bernard

Horology: time measuring systems or devices

Regulating means

For compensation

368204, G04B 1720, G04B 100

Patent

active

044485433

ABSTRACT:
An electronic time-of-day clock having a low-power time source and compensation circuits selectively operable responsive to pulses output from the low-power time source when system primary power is off or disabled, and responsive to a relatively highly accurate time-pulse generator when primary power is enabled. The time-of-day clock compensates continuously in real-time for errors in the output of the low-power time source caused by variations in the ambient temperature of the device; when primary power is enabled, the output of the low-power time source is further compensated by comparing the output thereof with the output of the high-accuracy frequency standard and storing accumulated error.

REFERENCES:
patent: Re31402 (1983-10-01), Hashimoto et al.
patent: 4286263 (1981-08-01), Lindberg
patent: 4305041 (1981-12-01), Ferking
patent: 4340808 (1982-07-01), Donohoo

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