Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With voltage or current conversion
Patent
1988-08-09
1990-03-13
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With voltage or current conversion
324119, G01R 1922
Patent
active
049085697
ABSTRACT:
A transformerless line powdered digital AC voltmeter for selected voltage ranges is disclosed which takes a minimum of electrical power from the AC line being measured. The AC input is firstly directed to an AC/DC converter to furnish a source of DC operative voltage, the AC/DC converter possessing external electronic circuitry to assure that an adequate minimum voltage appears as its input for any selected voltage range the invention measures. The AC voltage input to be measured is first halfwave rectified, and then voltage divided and smoothed before directed to the input of an A/D converter. The A/D converter has specific external circuitry added to it to assure that the output is accurate over the range of the voltages to be measured. The output of A/D converter is directed to a liquid crystal display which visually indicates the AC voltage measured. A external electronic circuit determines the decimal point for the voltage range measured.
REFERENCES:
patent: 2724821 (1955-11-01), Schweitzer
patent: 2729788 (1956-01-01), Schweitzer
patent: 3786480 (1974-01-01), Hatano et al.
patent: 3840808 (1974-10-01), Liebermann
patent: 4409545 (1983-10-01), Bazin
patent: 4422039 (1983-12-01), Davis
patent: 4575225 (1986-03-01), Yuasa et al.
McClanahan J. Michael
Strecker Gerard R.
Urban Edward
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