Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1977-10-31
1979-11-27
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324 73R, 328147, G01R 1700, G01R 1512, G01R 3102
Patent
active
041763149
ABSTRACT:
In a method of measuring electrical analog quantities, a first analog signal representing a first electrical analog quantity which is to be a reference is subtracted from a second analog signal representing a second electrical analog quantity which is to be compared with the first analog quantity, so that a difference signal is produced. Then, the difference signal thus produced is integrated for a predetermined time to obtain a third analog signal. Simultaneously therewith, the first analog signal is also integrated for the predetermined time to obtain a fourth and a fifth analog signal representing the positive and the negative value of the aforementioned integration. And the third analog signal is integrated between it and the fifth or the fourth analog signal in accordance with the positive or the negative sign of the third analog signal to obtain a sixth analog signal. Detection is made of the time from the point whereat the integration for obtaining the sixth analog signal is started till the point whereat the sixth analog signal becomes zero, so that a digital signal is produced. Thereafter, measurement is made of the ratio to the first analog quantity of the difference between the first electrical analog quantity and the second electrical analog quantity in accordance with the digital signal.
REFERENCES:
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patent: 3621387 (1971-11-01), Smith
patent: 3657527 (1972-04-01), Kassabgi et al.
patent: 3716783 (1973-02-01), Deering
patent: 3723867 (1973-03-01), Canarutto
patent: 3981586 (1976-09-01), Scott
Shin-Shirasuna Electric Corp.
Strecker Gerard R.
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