Measuring attachment connectible to a multimeter for measuring e

Details Measuring attachment connectible to a multimeter for measuring e Measuring attachment connectible to a multimeter for measuring e

1983-11-07

1986-05-20

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

G01R 2702, G01R 2726

Patent

active

045904219

ABSTRACT:
The invention provides a measuring attachment connectible to a multimeter for measuring earth resistances, comprising a casing having a first group of terminals for a measurement signal and a second group of terminals for electrical connection of the attachment to a multimeter, and electric circuits housed in the casing and comprising generator means for generating an AC current of constant value but of a frequency different from that of the mains and its harmonics, said generator means having an output connected to first and second terminals of said first group of terminals, and a synchronous detector having a measurement signal input which is connected to said second terminal and to a third terminal of said first group of terminals, a control input which is connected to said generator means and an output which is connected to first and second terminals of said second group of terminals.

REFERENCES:
patent: 3501694 (1970-03-01), Ito
patent: 4200835 (1980-04-01), Anahara
patent: 4209741 (1980-06-01), Coby
patent: 4415850 (1983-11-01), Sherwood
patent: 4446424 (1984-05-01), Chatanier
Messen und Prufen Vereinigt mit Automatik, vol. 16, May 1980, pp. 306-308, Worishofen (DE); Article by U. Oppelt.
Radio Mentor Electronic, vol. 44, No. 2, Feb. 1978, pp. 70, 71, Munchen (DE); Article "Metrix Meint Multimeter"; left Figure on p. 70.
Hewlett-Packard Journal, vol. 28, No. 1, Sep. 1976, pp. 9-15, Palo Alto (USA); S. Hashimoto et al.
BBC-Nachrichten, vol. 54, No. 9/10, Sep./Oct. 1972, pp. 241-252, Mannheim (DE); Article by K. O. Hoffmann.
Elektronik, vol. 18, No. 5, May 1969, pp. 135-137, Munchen (DE); Article by K. H. Kramer et al.

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