Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Transient or portion of cyclic
Patent
1980-05-15
1982-06-01
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Transient or portion of cyclic
324 57R, 324121R, 324158R, G01R 1900, G01R 2700, G01R 3100
Patent
active
043330495
ABSTRACT:
Inrush current measuring apparatus with an instantaneous power interruption device is provided an external power input terminal connected to a commercial power supply and an external power output terminal connected to a power unit under test, which terminals are connected together via a switching circuit section; and is equipped with a power interruption device in which the power supply from the external power input terminal to the external power output terminal is cut off or conducted by opening or closing the switching circuit section. By the adoption of a microcomputer serving as a central control circuit, various terminal circuit devices are made centrally controllable and a series of control actions are performed, and the open/close timing for the aforesaid switching circuit section is controlled by the microcomputer under desired set conditions with zero-cross point of commercial line voltage as the selection base, and for observing and displaying the behavior of voltage and current appearing on the external power output terminal side, successively input current value signals are sampled and the current value signals in front and in the rear are compared with each other successively in the order of input, and a peak-held current value signal is displayed by a digital display unit, and when observing the waveform of voltage and current a trigger pulse as a guideline for easier forecast of the observation start point is issued at a zero-cross point of half cycle ahead of the zero-cross point of the commercial line voltage which has been utilized as the selection base for cutoff and conduction timing.
REFERENCES:
patent: 3101611 (1963-08-01), Traver
patent: 3383589 (1968-05-01), Dugan, Jr.
Otsuka Kazuo
Takeoda Minoru
Yui Masatoshi
Karlsen Ernest F.
Takamisawa Cybernetics Co. Ltd.
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