Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Polyphase
Patent
1984-10-22
1987-02-03
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Polyphase
324115, 324114, G01R 1900, G01R 138, G01R 2900
Patent
active
046410902
ABSTRACT:
Apparatus is provided for simultaneously measuring and displaying voltage, current and frequency in a polyphase alternating current system. The apparatus is operable in either a line-to-line or a line-to-neutral measuring mode without rewiring the apparatus to the measured system. A logic circuit is selectively operated to connect the appropriate voltage lines associated with each phase of the system to the apparatus and LEDs associated with each phase light to indicate the phase selected for measurement. Multi-digit seven segment LED displays are provided for simultaneously indicating the voltage, current and frequency measured.
REFERENCES:
patent: 3778801 (1973-12-01), Nudelmont
patent: 3864631 (1975-02-01), Zitelli et al.
Eisenzopf Reinhard J.
Nguyen Vinh P.
Refac Electronics Corporation
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