Horology: time measuring systems or devices – Time interval – Electrical or electromechanical
Patent
1990-10-24
1992-06-02
Miska, Vit W.
Horology: time measuring systems or devices
Time interval
Electrical or electromechanical
368118, G04F 800
Patent
active
051193477
ABSTRACT:
By means of a potentiometer an analog voltage Ua is applied to an A/D converter. A reference voltage Uref is also applied to the A/D converter and the same produces a digital output information corresponding to the ratio between the analog voltage and the reference voltage. This digital output information of the A/D converter is periodically counted by a preselection counter and this counter delivers an output pulse whenever it has counted the value stored in the A/D converter. The potentiometer, A/D converter and counter form a time base of which the time unit depends on the position of the potentiometer only and not on fluctuations of the operating voltage. Due to the continuous periodic sampling and storing of the digital output information of the A/D converter, high accuracy of the time basis is obtained since a statistic mean value of the digital value is repeatedly counted.
REFERENCES:
patent: 4440503 (1984-04-01), Arichi et al.
patent: 4841497 (1989-06-01), Bateman et al.
Article to Larson "Cascading Timers Extend Delay Periods" 2119 E.D.N. (Electrical Design News) 29 1984 Aug., No. 17, Boston, Mass. U.S.A.
Miska Vit W.
Saia AG
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