Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Thermal
Patent
1975-06-11
1977-05-10
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Thermal
324106, G01R 522, G01R 1902
Patent
active
040230996
ABSTRACT:
A measuring arrangement for measuring the effective value of an a.c. signal. Said a.c. signal is applied to a first thermal convertor, while a d.c. output signal is applied to a second thermal convertor. The two thermal convertors differentially drive a differential amplifier, which at its outputs delivers the d.c. output signal. For values of the d.c. output signal which are smaller than a threshold value, a negative feedback signal which linearly depends on said d.c. output signal is applied via an additional negative-feedback network to at least one of the inputs of the differential amplifier. This facilitates zero-point adjustment, and also allows the measuring speed to be increased.
REFERENCES:
patent: 2857569 (1958-10-01), Gilbert et al.
patent: 3624525 (1971-11-01), Smith
Bloemen Hendrikus Fransiscus Bonifatius
Pieper Johannes Maria
Stulemeijer Eric Henricus Jozef Maria
VAN Kessel Theodorus Jozef
Franzblau Bernard
Karlsen Ernest F.
Rolinec Rudolph V.
Trifari Frank R.
U.S. Philips Corporation
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