Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1982-03-22
1985-03-05
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
324 725, G01R 19155, G01R 19165, G01R 1922
Patent
active
045033897
ABSTRACT:
A device for determining whether electrical equipment carries an alternating current that could endanger maintenance personnel or others in contact with the equipment comprises a conductive probe, a rectifier, a threshold detector and an alarm. The conductive probe makes electrical contact with the equipment, and the rectifier rectifies a fraction of any alternating current carried by the probe as a result of such contact to produce a unipolar signal. The threshold detector responds to the unipolar signal and generates an output signal when the voltage of the unipolar signal exceeds a predetermined threshold. The alarm gives a warning response to said output signal.
REFERENCES:
patent: 2884597 (1959-04-01), Miller
patent: 2942189 (1960-06-01), Shea et al.
patent: 3009099 (1961-11-01), Muller
patent: 3029383 (1962-04-01), Douglas et al.
patent: 3176223 (1965-03-01), Goodale
patent: 3309690 (1967-03-01), Moffitt
patent: 3660757 (1972-05-01), Winslow
patent: 3863149 (1975-01-01), Johnson
patent: 4152639 (1979-05-01), Chaffee
Bellamy, L. R., "Power Line Voltage Dip Detection", IBM Technical Disclosure Bulletin, vol. 17, No. 12, May 1975, p. 3513.
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